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Science

How can the sky be blue one day and stormy the next? Why do heavy objects tend to fall downwards when dropped? How are birds able to fly (and why can’t I do the same?)? Human beings have long been curious about the world in which we live, striving to identify connections among the phenomenons we witness and to understand how it all works. The field of science has developed over many centuries as a way of studying and understanding the world, beginning with the primitive stage of simply noting important regularities in nature and continuing through the rise of modern science. The modern-day sciences cover a vast range of fields, including biology, chemistry, meteorology, astronomy, physics, and much more.

See why the red panda is classified as the only member of the Ailuridae family

See why the red panda is classified as the only member of the Ailuridae family

Discern between monocotyledons with single-leaf seed sprouts and eudicotyledons with two-leaf seed sprouts

Discern between monocotyledons with single-leaf seed sprouts and eudicotyledons with two-leaf seed sprouts

Observe a demonstration of how wind energy transferred to water generates waves

Observe a demonstration of how wind energy transferred to water generates waves

Study the San Andreas Fault to see how horizontal movement displaces underlying rock and causes earthquakes

Study the San Andreas Fault to see how horizontal movement displaces underlying rock and causes earthquakes

Watch a tornado form during a strong thunderstorm

Watch a tornado form during a strong thunderstorm

Discover the differences between Louis Dollo's former reconstruction and David Norman's current reconstruction of Iguanodon

Discover the differences between Louis Dollo's former reconstruction and David Norman's current reconstruction of Iguanodon

Discern between body and surface waves, primary and secondary waves, and Love and Rayleigh waves

Discern between body and surface waves, primary and secondary waves, and Love and Rayleigh waves

Explore Uranus's nightside and ring system in this computer animation of the Voyager 2 space probe passing the planet on its way out of the solar system

Explore Uranus's nightside and ring system in this computer animation of the Voyager 2 space probe passing the planet on its way out of the solar system

Observe how an Anglerfish uses its unique anatomy to imitate a wriggling worm to lure in prey

Observe how an Anglerfish uses its unique anatomy to imitate a wriggling worm to lure in prey

What happens during a solar eclipse

What happens during a solar eclipse

Observe protozoan microorganisms from a drop of pond water under optical and electron microscopes

Observe protozoan microorganisms from a drop of pond water under optical and electron microscopes

Learn how plants use osmosis, facilitated diffusion, and active transport to ingest water and mineral salts

Learn how plants use osmosis, facilitated diffusion, and active transport to ingest water and mineral salts

Observe a land iguana, its burrow, and its herbivorous diet of cactus flowers, roots, and stems

Observe a land iguana, its burrow, and its herbivorous diet of cactus flowers, roots, and stems

Review how underwater earthquakes, volcanoes, or landslides can generate tsunamis

Review how underwater earthquakes, volcanoes, or landslides can generate tsunamis

Discover the nightmarish reproductive habits of the world's largest wasps with the most painful stings

Discover the nightmarish reproductive habits of the world's largest wasps with the most painful stings

See toads engage in amphibious amplexus and witness metamorphosis of tadpoles into toads

See toads engage in amphibious amplexus and witness metamorphosis of tadpoles into toads

Understand global warming as a factor in the decline of dissolved oxygen in the ocean

Understand global warming as a factor in the decline of dissolved oxygen in the ocean

Examine Aristotle's model of the solar system and note its failure to explain phenomena like retrograde motion

Examine Aristotle's model of the solar system and note its failure to explain phenomena like retrograde motion

Watch as a southern elephant seal pup is startled on the Argentinian coast and hear its snarl

Watch as a southern elephant seal pup is startled on the Argentinian coast and hear its snarl

Learn how the predatory pilot black snake strikes, suffocates, and consumes whole its rodent prey

Learn how the predatory pilot black snake strikes, suffocates, and consumes whole its rodent prey

Discern the difference between pahoehoe and aa volcanic lava flows at Kilauea, Hawaii

Discern the difference between pahoehoe and aa volcanic lava flows at Kilauea, Hawaii

See how enzymes in wax moth larva could lead to new recycling biotechnologies

See how enzymes in wax moth larva could lead to new recycling biotechnologies

Observe a colony of great white egrets eating, flying, and gathering near water

Observe a colony of great white egrets eating, flying, and gathering near water

Learn how the angiosperm and gymnosperm plants store their seeds

Learn how the angiosperm and gymnosperm plants store their seeds

Compare the elephant's 95-week gestation period with the marsupial American opossum's 12-13-day gestation

Compare the elephant's 95-week gestation period with the marsupial American opossum's 12-13-day gestation

See the disruption wrought by the kudzu vine, which was introduced to the southeastern United States

See the disruption wrought by the kudzu vine, which was introduced to the southeastern United States

Discover how a fern employs its vascular system to circulate water and nutrients between its leaves and roots

Discover how a fern employs its vascular system to circulate water and nutrients between its leaves and roots

Learn how hardy morning glory seeds' redundant genome and flavonoid-rich coats protect them from radiation

Learn how hardy morning glory seeds' redundant genome and flavonoid-rich coats protect them from radiation

Follow an amphibian's life cycle from an underwater egg to a land-roving organism

Follow an amphibian's life cycle from an underwater egg to a land-roving organism

Watch green sea turtles hatch from eggs and head to the ocean to avoid predators

Watch green sea turtles hatch from eggs and head to the ocean to avoid predators

Discover Magellanic penguins' namesake and see them gathering to breed on Valdés Peninsula, Argentina

Discover Magellanic penguins' namesake and see them gathering to breed on Valdés Peninsula, Argentina

Observe effects of smoking on lung tissue and examine various stages of respiratory disease

Observe effects of smoking on lung tissue and examine various stages of respiratory disease

watch a starfish's tube feet pry open a mussel's shell and extrude its stomach onto the mussel

watch a starfish's tube feet pry open a mussel's shell and extrude its stomach onto the mussel

Follow a Bacillus subtilis colony as it goes through the lag, log, stationary, and death phases of growth

Follow a Bacillus subtilis colony as it goes through the lag, log, stationary, and death phases of growth

Watch a pika forage for food in mountainous terrain and deliver a litter of fully dependent hairless pups

Watch a pika forage for food in mountainous terrain and deliver a litter of fully dependent hairless pups

See how water transforms between liquid, ice, and vapour in the water cycle

See how water transforms between liquid, ice, and vapour in the water cycle

Test whether solutions formed by ionic or covalent bonds show more electrical resistance

Test whether solutions formed by ionic or covalent bonds show more electrical resistance

Study spore-producing liverworts and their anatomic features such as gametes, thalli, and rhizoids

Study spore-producing liverworts and their anatomic features such as gametes, thalli, and rhizoids

Observe a kangaroo (a marsupial) carrying its joey and feeding and moving about in its natural habitat

Observe a kangaroo (a marsupial) carrying its joey and feeding and moving about in its natural habitat

See how astronauts train on parabolic fights to prepare for the weightlessness experienced in space

See how astronauts train on parabolic fights to prepare for the weightlessness experienced in space

Examine the differences in structure and function of endoskeletons and exoskeletons

Examine the differences in structure and function of endoskeletons and exoskeletons

Study how eccrine glands in the dermis secrete sweat through pores in the skin's surface

Study how eccrine glands in the dermis secrete sweat through pores in the skin's surface

Learn how chemical reactions are balanced through the metaphor of making change

Learn how chemical reactions are balanced through the metaphor of making change

Investigate the magnetlike ionic bond formed when electrons transfer from one atom to another

Investigate the magnetlike ionic bond formed when electrons transfer from one atom to another

Learn about and witness the blowfish's puffing defensive behaviour

Learn about and witness the blowfish's puffing defensive behaviour

Uncover Alfred Wegener's theory of continental drift through biological and geological evidence and the theory of plate tectonics

Uncover Alfred Wegener's theory of continental drift through biological and geological evidence and the theory of plate tectonics

Observe the importance of a mushroom's mycelium in the decomposition of organic matter

Observe the importance of a mushroom's mycelium in the decomposition of organic matter

Follow the trails of leafcutter ants stripping rainforest foliage to cultivate fungus-based food in their nest

Follow the trails of leafcutter ants stripping rainforest foliage to cultivate fungus-based food in their nest

Discover how water moves through plants, including osmosis and transpiration

Discover how water moves through plants, including osmosis and transpiration

Watch a Herpestes mongoose attack and kill its common prey, a venomous Asian cobra

Watch a Herpestes mongoose attack and kill its common prey, a venomous Asian cobra

Understanding the mechanics of human respiration

Understanding the mechanics of human respiration

Learn how a hummingbird can fly in any direction and about its iridescent plumage

Learn how a hummingbird can fly in any direction and about its iridescent plumage

Follow alpaca shearing and wool processing and weaving in the Andes

Follow alpaca shearing and wool processing and weaving in the Andes

Dive into stomate transpiration of a Pegonia plant highlighting functions of guard cells and root hairs

Dive into stomate transpiration of a Pegonia plant highlighting functions of guard cells and root hairs

Learn how mountains, bodies of water, and human habitation affect atmospheric activity

Learn how mountains, bodies of water, and human habitation affect atmospheric activity

Study how melanocytes produce skin-darkening melanin and the dangers of long exposure to sunlight

Study how melanocytes produce skin-darkening melanin and the dangers of long exposure to sunlight

Follow a burrowing earthworm seeking soil's moisture to protect its oxygen-collecting skin

Follow a burrowing earthworm seeking soil's moisture to protect its oxygen-collecting skin

Divide into four phases the reproduction process of chromosomes in plant and animal cells

Divide into four phases the reproduction process of chromosomes in plant and animal cells

$Perceive refraction as a wave's speed is changed by its passing between different media$

Perceive refraction as a wave's speed is changed by its passing between different media

Observe a zebra herd on the African plains and the mutualistic relationship it shares with the oxpecker

Observe a zebra herd on the African plains and the mutualistic relationship it shares with the oxpecker

examine a variety of echinoderm species such as starfish, basket star, sand dollar, and sea cucumber

examine a variety of echinoderm species such as starfish, basket star, sand dollar, and sea cucumber

Observe how Rayleigh waves traverse the free surface of an elastic solid such as Earth's surface

Observe how Rayleigh waves traverse the free surface of an elastic solid such as Earth's surface

Meet a 2,000-pound leatherback sea turtle and the pair of Russian tortoises that traveled to the Moon

Meet a 2,000-pound leatherback sea turtle and the pair of Russian tortoises that traveled to the Moon

Learn how resistance affects the flow of electrons in an electric circuit

Learn how resistance affects the flow of electrons in an electric circuit

Observe mountain lion cubs playing and being cared for and carried by their mother

Observe mountain lion cubs playing and being cared for and carried by their mother

Follow a female grasshopper as its eggs are fertilized, buried underground, and hatched

Follow a female grasshopper as its eggs are fertilized, buried underground, and hatched

Study the place of sedimentary rock in the rock cycle and how geologists classify such geologic formations

Study the place of sedimentary rock in the rock cycle and how geologists classify such geologic formations

View an Icelandic waterfall and learn about its geologic life cycle and erosion into a smooth riverbed

View an Icelandic waterfall and learn about its geologic life cycle and erosion into a smooth riverbed

Study how magma erupts as lava and turns into pumice or hardens to form a shield volcano

Study how magma erupts as lava and turns into pumice or hardens to form a shield volcano

Learn how Indo-Pacific lionfish species have become invasive in ecosystems around the globe

Learn how Indo-Pacific lionfish species have become invasive in ecosystems around the globe

Consider Jakob Steiner's Roman surface in which each tangent plane intersects the surface in a pair of conics

Consider Jakob Steiner's Roman surface in which each tangent plane intersects the surface in a pair of conics

Understand the relationship between a society's development and the management of its mineral resources

Understand the relationship between a society's development and the management of its mineral resources

Study DNA's double helix structure to learn how the organic chemical determines an organism's traits

Study DNA's double helix structure to learn how the organic chemical determines an organism's traits

Consider what makes the Komodo dragon's bite lethal and explore its Indonesian habitat

Consider what makes the Komodo dragon's bite lethal and explore its Indonesian habitat

Observe a pocket gopher using its front teeth and foreclaws to burrow a home full of roots, stems, and tubers

Observe a pocket gopher using its front teeth and foreclaws to burrow a home full of roots, stems, and tubers

Take an in-depth look at the variety of plankton, from diatoms and microflagellates to jellyfish

Take an in-depth look at the variety of plankton, from diatoms and microflagellates to jellyfish

Learn how the Richter scale measures magnitude and the Mercalli scale measures intensity of an earthquake

Learn how the Richter scale measures magnitude and the Mercalli scale measures intensity of an earthquake

See the poisonous squirting cucumber eject mucilage-covered seeds

See the poisonous squirting cucumber eject mucilage-covered seeds

Investigate various types of phytoplankton, their anatomies, and their means of photosynthesis

Investigate various types of phytoplankton, their anatomies, and their means of photosynthesis

Follow the electrical and chemical changes undergone to transmit an impulse through the human nervous system

Follow the electrical and chemical changes undergone to transmit an impulse through the human nervous system

Study how sieve plates and suction-cupped tube feet enable sea stars to catch prey and move through water

Study how sieve plates and suction-cupped tube feet enable sea stars to catch prey and move through water

Watch a caterpillar larva eat milkweed, form a pupa, and emerge as a monarch butterfly

Watch a caterpillar larva eat milkweed, form a pupa, and emerge as a monarch butterfly

Learn how paired chromosomes composed of mostly DNA determine an organism's heredity

Learn how paired chromosomes composed of mostly DNA determine an organism's heredity

Observe how the sporophytic fern appears to unfurl upward as it grows from its rhizome

Observe how the sporophytic fern appears to unfurl upward as it grows from its rhizome

Study bacteria's role in organic decomposition, from forest floors to landfills and wastewater-treatment plants

Study bacteria's role in organic decomposition, from forest floors to landfills and wastewater-treatment plants

Investigate how high radiant heat loss causes water vapor to condense into dew droplets

Investigate how high radiant heat loss causes water vapor to condense into dew droplets

Watch buildings crumble during the volcanic eruption of Italy's Mount Vesuvius in 1944

Watch buildings crumble during the volcanic eruption of Italy's Mount Vesuvius in 1944

Tour the Pampas to catch sight of a giant anteater, crab-eating fox, and pampas deer

Tour the Pampas to catch sight of a giant anteater, crab-eating fox, and pampas deer

Observe time-lapse photography of Penicillium mold releasing penicillin to its surroundings

Observe time-lapse photography of Penicillium mold releasing penicillin to its surroundings

The difference between meteors, meteorites, and meteoroids

The difference between meteors, meteorites, and meteoroids

Watch clouds transforming into tornadoes

Watch clouds transforming into tornadoes

Observe an Eciton army ant colony migrating by night and forming a bivouac nest entirely out of themselves

Observe an Eciton army ant colony migrating by night and forming a bivouac nest entirely out of themselves

Learn about female and male pine cones and their roles in pine tree reproduction

Learn about female and male pine cones and their roles in pine tree reproduction

Classify volcanic eruptions according to the physical and chemical properties of their magma

Classify volcanic eruptions according to the physical and chemical properties of their magma

See stalagmites and stalactites formed by carbonite mineral deposits from limestone dissolved by groundwater

See stalagmites and stalactites formed by carbonite mineral deposits from limestone dissolved by groundwater

Learn how pollution from industrial emissions and car exhaust is trapped against mountains to cause smog

Learn how pollution from industrial emissions and car exhaust is trapped against mountains to cause smog

Examine how bacteria can be beneficial ecological agents of decomposition but harmful spoilers of food and agents of disease

Examine how bacteria can be beneficial ecological agents of decomposition but harmful spoilers of food and agents of disease

Learn about the characteristics, reproductive habits, and different species of seahorses

Learn about the characteristics, reproductive habits, and different species of seahorses

Observe the human immune response phagocytosis

Observe the human immune response phagocytosis

Observe the hagfish's horny teeth and scaleless exterior covering a cartilaginous skeleton

Observe the hagfish's horny teeth and scaleless exterior covering a cartilaginous skeleton

Discover how the volcanic island of Surtsey formed for ash and lava erupting from the seafloor near Iceland

Discover how the volcanic island of Surtsey formed for ash and lava erupting from the seafloor near Iceland

Observe flightless cormorants in their natural habitat on coasts of Fernandina and Isabela islands

Observe flightless cormorants in their natural habitat on coasts of Fernandina and Isabela islands

Study how bacteriophages replicate by injecting nucleic acid into a bacteria cell to create virions

Study how bacteriophages replicate by injecting nucleic acid into a bacteria cell to create virions

Inspect a cross-section of dermis and epidermis and see papillae, blood and lymph vessels, muscles, and nerves

Inspect a cross-section of dermis and epidermis and see papillae, blood and lymph vessels, muscles, and nerves

View elephant seals on Argentina's southern coast and Magellan penguins on the country's Valdes Peninsula

View elephant seals on Argentina's southern coast and Magellan penguins on the country's Valdes Peninsula

Earth's revolution and rotation around the Sun, explained

Earth's revolution and rotation around the Sun, explained

Consider how a single-celled organism contains the necessary structures to eat, grow, and reproduce

Consider how a single-celled organism contains the necessary structures to eat, grow, and reproduce

Witness the playful gliding and fishing of river otters in a freshly thawed North American river

Witness the playful gliding and fishing of river otters in a freshly thawed North American river

Uncover the geologic history of the Grand Canyon stretching back to the Archean Eon

Uncover the geologic history of the Grand Canyon stretching back to the Archean Eon

Examine how water held back by Egypt's Aswan High Dam turns turbines to generate electricity

Examine how water held back by Egypt's Aswan High Dam turns turbines to generate electricity

Discover how astronauts mimic space's microgravity on Earth with a special plane and a ballistic flight path

Discover how astronauts mimic space's microgravity on Earth with a special plane and a ballistic flight path

Discover how individual cilia employ viscous drag to coordinate power and recovery strokes for locomotion

Discover how individual cilia employ viscous drag to coordinate power and recovery strokes for locomotion

Examine the relationship between Northern fur seal cows and their pups and see how pups learn to swim

Examine the relationship between Northern fur seal cows and their pups and see how pups learn to swim

Investigate declines in tiger populations threatened by habitat fragmentation and illegal hunting

Investigate declines in tiger populations threatened by habitat fragmentation and illegal hunting

Examine how earthquake shock waves can generate a tsunami like the one that crashed down on Hilo in 1946

Examine how earthquake shock waves can generate a tsunami like the one that crashed down on Hilo in 1946

Learn how wolves are migrating from Germany back into Denmark after having been exterminated two centuries ago

Learn how wolves are migrating from Germany back into Denmark after having been exterminated two centuries ago

Watch the courtship display of the male Anna's hummingbird and the hen's use of food to coax fledglings to fly

Watch the courtship display of the male Anna's hummingbird and the hen's use of food to coax fledglings to fly

Consider how Isaac Newton's discovery of gravity led to a better understanding of planetary motion

Consider how Isaac Newton's discovery of gravity led to a better understanding of planetary motion

See how bacteria recycle forest litter into water, carbon dioxide, nitrogen, and soil minerals

See how bacteria recycle forest litter into water, carbon dioxide, nitrogen, and soil minerals

Uncover the forces of potential energy, kinetic energy, and friction behind a grandfather clock's pendulum

Uncover the forces of potential energy, kinetic energy, and friction behind a grandfather clock's pendulum

Watch a tree frog lay eggs, and see through a glass frog's skin to glimpse its inner anatomy

Watch a tree frog lay eggs, and see through a glass frog's skin to glimpse its inner anatomy

Witness a crocodile hatchling emerge from its egg and call for its mother

Witness a crocodile hatchling emerge from its egg and call for its mother

Discover the importance of Sputnik, Yuri Gagarin, Apollo 11, the Hubble Space Telescope, and SpaceShipOne

Discover the importance of Sputnik, Yuri Gagarin, Apollo 11, the Hubble Space Telescope, and SpaceShipOne

Learn five facts about the astronomical phenomenon that occurs when the Moon passes between the Sun and Earth

Learn five facts about the astronomical phenomenon that occurs when the Moon passes between the Sun and Earth

Zoom in on the serpentine locomotion of the limbless, amphibious caecilian over soil

Zoom in on the serpentine locomotion of the limbless, amphibious caecilian over soil

How does periodic law help us understand elements' properties and how they relate to one another?

How does periodic law help us understand elements' properties and how they relate to one another?

Study dangerous turtles and lizards such as Gila monsters, crocodile monitors, and Komodo dragons

Study dangerous turtles and lizards such as Gila monsters, crocodile monitors, and Komodo dragons

Observe a baboon troop descend from treetops to rove, play, and forage in the Tanzanian landscape

Observe a baboon troop descend from treetops to rove, play, and forage in the Tanzanian landscape

Discern between self-sustaining autotrophs and consumer heterotrophs and find their places in the food chain

Discern between self-sustaining autotrophs and consumer heterotrophs and find their places in the food chain

Learn how hibernating ground squirrels lower their body temperatures to enter a dormant state

Learn how hibernating ground squirrels lower their body temperatures to enter a dormant state

Explore the nascent industry of space tourism, in which people pay to be launched into space

Explore the nascent industry of space tourism, in which people pay to be launched into space

Witness crop destruction by hail and examine a hailstone's interior under polarized light

Witness crop destruction by hail and examine a hailstone's interior under polarized light

Glimpse Amazonian wildlife such as anacondas, tarantulas, leafcutter ants, scarlet ibis, and black skimmers

Glimpse Amazonian wildlife such as anacondas, tarantulas, leafcutter ants, scarlet ibis, and black skimmers

Classify colors on the visible spectrum of electromagnetic radiation by hue, saturation, and brightness

Classify colors on the visible spectrum of electromagnetic radiation by hue, saturation, and brightness

Follow a beaver family and its kits for a year in the Rocky Mountains and learn about their habits and habitat

Follow a beaver family and its kits for a year in the Rocky Mountains and learn about their habits and habitat

Discover how the Moon's equal periods of rotation and revolution affect its orientation toward Earth

Discover how the Moon's equal periods of rotation and revolution affect its orientation toward Earth

Explore how interactions between the water cycle and landforms affect climate and weather

Explore how interactions between the water cycle and landforms affect climate and weather

Go inside a tropical cyclone's eye to learn how low-pressure cores exist amid cloud walls and high winds

Go inside a tropical cyclone's eye to learn how low-pressure cores exist amid cloud walls and high winds

Observe silky anteaters navigate rainforest treetops with their prehensile tails

Observe silky anteaters navigate rainforest treetops with their prehensile tails

Is the mesentery a distinct organ?

Is the mesentery a distinct organ?

Examine how llamas serve as pack animals and wool sources in highlands of Bolivia, Chile, and Peru

Examine how llamas serve as pack animals and wool sources in highlands of Bolivia, Chile, and Peru

Observe permanent plankton, including transparent larvaceans, ciliate protozoans, and other zooplankton

Observe permanent plankton, including transparent larvaceans, ciliate protozoans, and other zooplankton

Examine commensalism among fish species such as shrimp, the neon goby, and moray eels

Examine commensalism among fish species such as shrimp, the neon goby, and moray eels

The difference between “poisonous” and “venomous”

The difference between “poisonous” and “venomous”

Follow hormones of the endocrine system from glands to their chemical receptors on or in a cell

Follow hormones of the endocrine system from glands to their chemical receptors on or in a cell

Observe the aggressive social behaviour of territorial perciform jawfish fighting over burrow proximity

Observe the aggressive social behaviour of territorial perciform jawfish fighting over burrow proximity

What does it take to become an astronaut?

What does it take to become an astronaut?

Understand how the presence of different pigments chlorophyll, anthocyanin, anthoxanthins, and carotenoids determine a plant's color

Understand how the presence of different pigments chlorophyll, anthocyanin, anthoxanthins, and carotenoids determine a plant's color

Study the effects of increasing concentrations of carbon dioxide on Earth's atmosphere and plant life

Study the effects of increasing concentrations of carbon dioxide on Earth's atmosphere and plant life

Find out why suction cups don't work in outer space

Find out why suction cups don't work in outer space

Examine the ecologic importance, life cycle, and anatomical structures of the freshwater crustaceans Daphnia

Examine the ecologic importance, life cycle, and anatomical structures of the freshwater crustaceans Daphnia

Learn how astronauts exercise to combat the effects of microgravity on their bone and muscle masses

Learn how astronauts exercise to combat the effects of microgravity on their bone and muscle masses

Discover why some volcanic eruptions are more explosive, like at Mount Pinatubo in contrast to Kilauea

Discover why some volcanic eruptions are more explosive, like at Mount Pinatubo in contrast to Kilauea

Learn how Johannes Kepler challenged the Copernican system of planetary motion

Learn how Johannes Kepler challenged the Copernican system of planetary motion

Watch P waves (primary waves) travel through an elastic medium

Watch P waves (primary waves) travel through an elastic medium

Study the migratory, predatory, and living habits of North American bald eagles

Study the migratory, predatory, and living habits of North American bald eagles

Watch how a tire-swing pendulum demonstrates the law of conservation of energy

Watch how a tire-swing pendulum demonstrates the law of conservation of energy

Explore surface tension and how it varies from one liquid to another

Explore surface tension and how it varies from one liquid to another

Discover the ways to measure a forest and calculate the biomass of the organic material in a temperate forest

Discover the ways to measure a forest and calculate the biomass of the organic material in a temperate forest

Follow water in its many forms, from glaciers and clouds to freshwater rivers and saltwater oceans

Follow water in its many forms, from glaciers and clouds to freshwater rivers and saltwater oceans

Learn how Earth's crustal plates grind against each other and send energy waves in all directions

Learn how Earth's crustal plates grind against each other and send energy waves in all directions

Examine how a leopard frog's protruding independent eyes help it catch flies, earthworms, and other prey

Examine how a leopard frog's protruding independent eyes help it catch flies, earthworms, and other prey

Study the impact of greenhouse-gas emissions on Earth's temperature and sea levels

Study the impact of greenhouse-gas emissions on Earth's temperature and sea levels

Consider the theory of a large meteor or comet striking Earth and causing the extinction of dinosaurs

Consider the theory of a large meteor or comet striking Earth and causing the extinction of dinosaurs

Learn how invasive species and habitat destruction have threatened Hawaii's yellow-faced bees

Learn how invasive species and habitat destruction have threatened Hawaii's yellow-faced bees

Study the interdependence of a cell's nucleus, ribosomes, endoplasmic reticulum, and Golgi apparatus

Study the interdependence of a cell's nucleus, ribosomes, endoplasmic reticulum, and Golgi apparatus

See how sieve tubes and sieve plates stimulate mass flow within a plant's phloem cells

See how sieve tubes and sieve plates stimulate mass flow within a plant's phloem cells

Learn how annual flowers survive harsh desert conditions and how cacti provide sustenance for wildlife

Learn how annual flowers survive harsh desert conditions and how cacti provide sustenance for wildlife

How do red blood cells circulate oxygen throughout the human body?

How do red blood cells circulate oxygen throughout the human body?

Zoom out from Earth's solar system to the Milky Way Galaxy, the Local Group, and beyond

Zoom out from Earth's solar system to the Milky Way Galaxy, the Local Group, and beyond

View a time-lapse video of cloud formations rolling across the sky followed by a thunderstorm

View a time-lapse video of cloud formations rolling across the sky followed by a thunderstorm

Study the distinctive characteristics of the North American timber tulip tree of the magnolia family

Study the distinctive characteristics of the North American timber tulip tree of the magnolia family

Uncover interesting tidbits about the flightless kakapo, the African gray parrot, and blue and gold macaws

Uncover interesting tidbits about the flightless kakapo, the African gray parrot, and blue and gold macaws

Walk through the process of mitotic cell division to understand the foundation of growth

Walk through the process of mitotic cell division to understand the foundation of growth

See how sea otters maintain the balance of kelp-forest ecosystems by consuming sea urchins

See how sea otters maintain the balance of kelp-forest ecosystems by consuming sea urchins

Study the different ways mushrooms release spores and watch mold hyphae spread across bread

Study the different ways mushrooms release spores and watch mold hyphae spread across bread

Study how Ptolemy tried to use deferents and epicycles to explain retrograde motion

Study how Ptolemy tried to use deferents and epicycles to explain retrograde motion

Examine glacial scratches on rocks from Switzerland to New York City for evidence of Earth's icy past

Examine glacial scratches on rocks from Switzerland to New York City for evidence of Earth's icy past

See molecular bonds at work as two hydrogen atoms join a sulfur atom to make hydrogen sulfide

See molecular bonds at work as two hydrogen atoms join a sulfur atom to make hydrogen sulfide

Meet longhair cat breeds from Balinese and Cymric to Javanese and Norwegian Forest cats

Meet longhair cat breeds from Balinese and Cymric to Javanese and Norwegian Forest cats

Learn how the Brazilian government incentivized forest clearing in the Amazon for beef production and ranching

Learn how the Brazilian government incentivized forest clearing in the Amazon for beef production and ranching

Observe a tower of giraffes feeding on acacia leaves and oxpeckers combing giraffes' coats for parasites

Observe a tower of giraffes feeding on acacia leaves and oxpeckers combing giraffes' coats for parasites

Examine the preparation measures taken by foraging pikas and hibernating ground squirrels

Examine the preparation measures taken by foraging pikas and hibernating ground squirrels

Phloem and xylem: Difference in a plant's vascular system, explained

Phloem and xylem: Difference in a plant's vascular system, explained

Study a grasshopper feeding on a leaf and learn how fast a grasshopper cloud can consume a farmer's crops

Study a grasshopper feeding on a leaf and learn how fast a grasshopper cloud can consume a farmer's crops

Examine the trophic levels of producers, herbivores, and carnivores in a given ecosystem

Examine the trophic levels of producers, herbivores, and carnivores in a given ecosystem

Watch living epidermal cells near the dermis push old cells toward the skin surface to die and become keratin protein

Watch living epidermal cells near the dermis push old cells toward the skin surface to die and become keratin protein

Explore the Arctic doomsday vault preserving the planet's seeds in the Svalbard archipelago

Explore the Arctic doomsday vault preserving the planet's seeds in the Svalbard archipelago

Discover how much nitrogen, oxygen, water vapour, carbon dioxide, and other elements constitute Earth's air

Discover how much nitrogen, oxygen, water vapour, carbon dioxide, and other elements constitute Earth's air

Observe the South American lowland tapir wading in a swamp for food

Observe the South American lowland tapir wading in a swamp for food

Dissect the anatomy of icosahedral, rod-shaped, and bacteriophage virus structures in electron micrographs

Dissect the anatomy of icosahedral, rod-shaped, and bacteriophage virus structures in electron micrographs

See how Love waves travel near the surface of a solid medium of varying vertical elasticity

See how Love waves travel near the surface of a solid medium of varying vertical elasticity

Explore how plastic is recycled into insulation and other building materials

Explore how plastic is recycled into insulation and other building materials

Behold Saguaro National Park plant life. such as the saguaro cactus, unique to the Sonoran Desert

Behold Saguaro National Park plant life. such as the saguaro cactus, unique to the Sonoran Desert

Watch a doe give birth to a pair of fawns and then care for them and guide them

Watch a doe give birth to a pair of fawns and then care for them and guide them

Learn how phytoplankton supply oxygen via photosynthesis and serve as the first link in the marine food chain

Learn how phytoplankton supply oxygen via photosynthesis and serve as the first link in the marine food chain

Follow the development of rice-paddy fish from fertilization to hatching in a laboratory setting

Follow the development of rice-paddy fish from fertilization to hatching in a laboratory setting

Observe sea star reproduction, from egg and sperm release and fertilization to development of zooplankton embryos and larvae

Observe sea star reproduction, from egg and sperm release and fertilization to development of zooplankton embryos and larvae

Time-lapse: A total lunar eclipse

Time-lapse: A total lunar eclipse

Study the courtship practices of these flightless ratites and watch a mother ostrich care for its young

Study the courtship practices of these flightless ratites and watch a mother ostrich care for its young

Follow water as it cycles through the air, land, lakes and rivers, and oceans

Follow water as it cycles through the air, land, lakes and rivers, and oceans

Track the development of a human being from embryo to fetus to newborn

Track the development of a human being from embryo to fetus to newborn

Watch a North American raccoon scale a tree to steal eggs from a red-tailed hawk's nest

Watch a North American raccoon scale a tree to steal eggs from a red-tailed hawk's nest

What on Earth is space junk?

What on Earth is space junk?

Learn how tornadoes are formed and also how modern technologies help meteorologists track the moisture and pressure in the air for early signs of tornado formation

Learn how tornadoes are formed and also how modern technologies help meteorologists track the moisture and pressure in the air for early signs of tornado formation

Understand how roots and leaves transport oxygen, carbon dioxide, and minerals vital to a plant's development

Understand how roots and leaves transport oxygen, carbon dioxide, and minerals vital to a plant's development

Observe a chameleon's zygodactylous feet, acrodont dentition, independent eyes, and projectile tongue at work

Observe a chameleon's zygodactylous feet, acrodont dentition, independent eyes, and projectile tongue at work

Consider how the invention of the microscope abetted the discovery and categorization of cells

Consider how the invention of the microscope abetted the discovery and categorization of cells

Learn how termites use salivary secretions to cement debris to decaying wood nests in their rainforest habitat

Learn how termites use salivary secretions to cement debris to decaying wood nests in their rainforest habitat

Watch how a queen triggerfish defeats a sea urchin's defensive tactics

Watch how a queen triggerfish defeats a sea urchin's defensive tactics

Investigate varying electron configurations in electron shells around an atom's nucleus

Investigate varying electron configurations in electron shells around an atom's nucleus

Watch a marine worm's tentacles emerge from its tube, exposing mucous traps for food particles

Watch a marine worm's tentacles emerge from its tube, exposing mucous traps for food particles

Understand the sexual and asexual reproduction from the bramble and the daffodil plant

Understand the sexual and asexual reproduction from the bramble and the daffodil plant

Examine how a subcutaneous fat layer supplies nutrients to dense connective tissue and epithelial cells

Examine how a subcutaneous fat layer supplies nutrients to dense connective tissue and epithelial cells

Learn how the radiometric rubidium-strontium dating technique is used to determine the age of rock particles

Learn how the radiometric rubidium-strontium dating technique is used to determine the age of rock particles

Compare and contrast liverworts and mosses in their reproduction, water absorption, and energy generation

Compare and contrast liverworts and mosses in their reproduction, water absorption, and energy generation

Watch cress seeds absorb water to catalyze the metabolic activity involved in germination

Watch cress seeds absorb water to catalyze the metabolic activity involved in germination

Learn how the Sun warms moist air near the ground and causes it to rise and condense on dust particles

Learn how the Sun warms moist air near the ground and causes it to rise and condense on dust particles

Examine the various changes undergone by an elk's coat from winter to summer and from nursing calves to adults who eventually separate to form new herds

Examine the various changes undergone by an elk's coat from winter to summer and from nursing calves to adults who eventually separate to form new herds

Examine how the theory of plate tectonics explains volcanic activity, earthquakes, and mountains

Examine how the theory of plate tectonics explains volcanic activity, earthquakes, and mountains

Determine the chemical composition of Earth's atmosphere and discover the forces behind wind patterns

Determine the chemical composition of Earth's atmosphere and discover the forces behind wind patterns

Observe an anole change its skin colour for camouflage and fan its dewlap to mark possession or attract a mate

Observe an anole change its skin colour for camouflage and fan its dewlap to mark possession or attract a mate

Behold a true beaked whale mother and calf near the Azores and Canary Islands

Behold a true beaked whale mother and calf near the Azores and Canary Islands

Witness an orb-weaving spider using silk wrappings to immobilize grasshopper prey

Witness an orb-weaving spider using silk wrappings to immobilize grasshopper prey

How are hurricanes and typhoons named?

How are hurricanes and typhoons named?

explorations of Mars

explorations of Mars

Study the Permian Period's carnivorous Dimetrodon and its sail's role in thermoregulation

Study the Permian Period's carnivorous Dimetrodon and its sail's role in thermoregulation

See how the passionflower ensures cross-pollination

See how the passionflower ensures cross-pollination

Observe flocks of masked, red-footed, and blue-footed booby species common to the Galápagos coasts

Observe flocks of masked, red-footed, and blue-footed booby species common to the Galápagos coasts

Discover how heat from Earth's core creates convection currents that cause crustal plates to shift

Discover how heat from Earth's core creates convection currents that cause crustal plates to shift

Observe a scarlet macaw using its beak and talons to obtain food

Observe a scarlet macaw using its beak and talons to obtain food

See how an updraft of warm, unstable air moves the tornado vortex upward in expanding spirals

See how an updraft of warm, unstable air moves the tornado vortex upward in expanding spirals

How is a bison different from a buffalo?

How is a bison different from a buffalo?

Discover the copepod's place in the marine food chain and how it develops from a larva into an adult

Discover the copepod's place in the marine food chain and how it develops from a larva into an adult

Study how marine iguanas live on the coasts of the Galapagos Islands and survive on seaweeds

Study how marine iguanas live on the coasts of the Galapagos Islands and survive on seaweeds

Discern the difference between heat and temperature and review the three types of heat transfer

Discern the difference between heat and temperature and review the three types of heat transfer

Explore an atom's interior to discover the layout of its nucleus, protons, and electrons

Explore an atom's interior to discover the layout of its nucleus, protons, and electrons

Consider the whooping crane's migratory patterns and how the human population has contributed to the destruction of its habitat

Consider the whooping crane's migratory patterns and how the human population has contributed to the destruction of its habitat

See how parasitic plants form vascular unions with hosts to compensate for an inability to photosynthesize

See how parasitic plants form vascular unions with hosts to compensate for an inability to photosynthesize

Consider the theory of isostasy as an explanation for landforms and the geologic cycle

Consider the theory of isostasy as an explanation for landforms and the geologic cycle

Witness a combustion reaction between oxygen and cellulose to produce water, carbon dioxide, and carbon

Witness a combustion reaction between oxygen and cellulose to produce water, carbon dioxide, and carbon

Compare monocotyledons' embryonic endosperm to dicotyledons' prephotosynthesis food storage system

Compare monocotyledons' embryonic endosperm to dicotyledons' prephotosynthesis food storage system

Glimpse Amazonian wildlife, including birds, mammals, and reptiles

Glimpse Amazonian wildlife, including birds, mammals, and reptiles

Investigate the role of water in erosion and in the greater geologic rock cycle

Investigate the role of water in erosion and in the greater geologic rock cycle

Study the long-lived Greenland sharks inhabiting the Arctic Ocean and North Atlantic

Study the long-lived Greenland sharks inhabiting the Arctic Ocean and North Atlantic

Try to find brown leaf and leaf-blemish katydids as they mimic their surroundings for camouflage

Try to find brown leaf and leaf-blemish katydids as they mimic their surroundings for camouflage

Behold the rattlesnake's rattle, thought to be a warning device to other organisms

Behold the rattlesnake's rattle, thought to be a warning device to other organisms

Learn how advancements in the xylem, vascular tissue, and flower separate angiosperms from gymnosperms

Learn how advancements in the xylem, vascular tissue, and flower separate angiosperms from gymnosperms

Examine what happens to the electrons of two neutral objects rubbed together in a dry environment

Examine what happens to the electrons of two neutral objects rubbed together in a dry environment

See how physicist Robert Millikan devised a method for measuring the electric charge of single electrons

See how physicist Robert Millikan devised a method for measuring the electric charge of single electrons

Brush up on anthers, stigmas, florets, and insects with a self- and cross-pollination guide

Brush up on anthers, stigmas, florets, and insects with a self- and cross-pollination guide

Study the unique evolution of species adaptions and biological diversity in the Galapagos Islands

Study the unique evolution of species adaptions and biological diversity in the Galapagos Islands

How does the cerebellum help maintain muscle tone, posture, and equilibrium?

How does the cerebellum help maintain muscle tone, posture, and equilibrium?

Witness the sensitive plant's rapid movement when touched, which may be a defense mechanism

Witness the sensitive plant's rapid movement when touched, which may be a defense mechanism

Behold a time-lapse video of a mushroom cap's emergence from the ground

Behold a time-lapse video of a mushroom cap's emergence from the ground

Track the process of ecological succession from weeds to towering oaks and hickories in a climax community

Track the process of ecological succession from weeds to towering oaks and hickories in a climax community

How do fairy rings form?

How do fairy rings form?

Compare toothed whales' high-frequency echolocation to baleen whales' low-frequency communication

Compare toothed whales' high-frequency echolocation to baleen whales' low-frequency communication

Discussion with Kara Rogers of how the scientific model is used to test a hypothesis or represent a theory

Discussion with Kara Rogers of how the scientific model is used to test a hypothesis or represent a theory

Watch a demonstration of Isaac Newton's law of action and reaction as a rocket launches into space

Watch a demonstration of Isaac Newton's law of action and reaction as a rocket launches into space

Learn how hermaphroditic coral reproduces once a year after a full moon in good water conditions

Learn how hermaphroditic coral reproduces once a year after a full moon in good water conditions

Consider how Heinrich Hertz's discovery of the photoelectric effect led to Albert Einstein's theory of light

Consider how Heinrich Hertz's discovery of the photoelectric effect led to Albert Einstein's theory of light

Dissect a chloroplast and identify its stroma, thylakoids, and chlorophyll-packed grana

Dissect a chloroplast and identify its stroma, thylakoids, and chlorophyll-packed grana

Observe in slow motion how North American toads change the potential energy in their hind legs to kinetic energy to power their leaps

Observe in slow motion how North American toads change the potential energy in their hind legs to kinetic energy to power their leaps

Compare the Rafflesia arnoldii's massive bloom with Amorphophallus titanum's towering inflorescence

Compare the Rafflesia arnoldii's massive bloom with Amorphophallus titanum's towering inflorescence

Know the various melon and gourd species, such as the summer favourite watermelon and the natural sponge loofah

Know the various melon and gourd species, such as the summer favourite watermelon and the natural sponge loofah

Follow the nitrogen and phosphorus cycles and learn why farmers fertilize fields to keep them productive

Follow the nitrogen and phosphorus cycles and learn why farmers fertilize fields to keep them productive

See samples of what is possibly soft tissue discovered in a Lufengosaurus fossil from the Jurassic Period

See samples of what is possibly soft tissue discovered in a Lufengosaurus fossil from the Jurassic Period

Witness the beauty of various flower blossoms blooming

Witness the beauty of various flower blossoms blooming

Discover how climate change and food scarcity may have caused the megalodon's extinction

Discover how climate change and food scarcity may have caused the megalodon's extinction

Compare differences in the leaf structures and environments of flowering dicots, ferns, pine trees, and cacti

Compare differences in the leaf structures and environments of flowering dicots, ferns, pine trees, and cacti

Witness the bullfrog's powerful action, generated by its hind legs, as it jumps through a field

Witness the bullfrog's powerful action, generated by its hind legs, as it jumps through a field

Follow the history of U.S. spaceflight from Pres. John F. Kennedy to Neil Armstrong and Apollo 11

Follow the history of U.S. spaceflight from Pres. John F. Kennedy to Neil Armstrong and Apollo 11

Behold near-boiling water spurting from geysers and hot springs in Wyoming's Yellowstone National Park

Behold near-boiling water spurting from geysers and hot springs in Wyoming's Yellowstone National Park

Observe diatoms, microscopic sea organisms encased in silicified cell walls with intricate designs

Observe diatoms, microscopic sea organisms encased in silicified cell walls with intricate designs

Watch a silica glass preform heated by a furnace be turned into an optical fibre

Watch a silica glass preform heated by a furnace be turned into an optical fibre

Discover how bacteria evolved to survive in Earth's most extreme habitats, such as seafloor volcanic vents

Discover how bacteria evolved to survive in Earth's most extreme habitats, such as seafloor volcanic vents

Discover how genetic material is exchanged between bacteria via conjugation and transduction

Discover how genetic material is exchanged between bacteria via conjugation and transduction

Investigate how muscles in the body wall and small bristles enable earthworms to move through soil

Investigate how muscles in the body wall and small bristles enable earthworms to move through soil

Witness a grasshopper molting as it sheds its outgrown exoskeleton

Witness a grasshopper molting as it sheds its outgrown exoskeleton

Observe a single mature cell splitting into two duplicate daughter cells

Observe a single mature cell splitting into two duplicate daughter cells

Follow a sea plow burying a fibre optic cable with repeaters for efficient information transmission

Follow a sea plow burying a fibre optic cable with repeaters for efficient information transmission

Examine how Falco peregrinus uses controlled falls and outstretched talons to prey on pigeons and ducks

Examine how Falco peregrinus uses controlled falls and outstretched talons to prey on pigeons and ducks

Learn how a genetic fingerprint is made using agarose gel, Southern blotting, and a radioactive DNA probe

Learn how a genetic fingerprint is made using agarose gel, Southern blotting, and a radioactive DNA probe

Observe a herd of gazelles grazing, playing, and nursing in their natural habitat on the African plains

Observe a herd of gazelles grazing, playing, and nursing in their natural habitat on the African plains

Study DNA's double-helix structure, nitrogenous bases, nucleotides, sugar molecules, and phosphate groups

Study DNA's double-helix structure, nitrogenous bases, nucleotides, sugar molecules, and phosphate groups

Study cheetahs playing and grooming one another before hunting gazelle herd

Study cheetahs playing and grooming one another before hunting gazelle herd

Learn about the structure of chloroplast and its role in photosynthesis

Learn about the structure of chloroplast and its role in photosynthesis

Learn how the Andes Mountains block warm moist air, causing heavy rainfall that feeds the Amazon River

Learn how the Andes Mountains block warm moist air, causing heavy rainfall that feeds the Amazon River

Explore the anatomy of a plant's mesophyll to understand how chlorophyll generates a green appearance

Explore the anatomy of a plant's mesophyll to understand how chlorophyll generates a green appearance

Study the evaporation process of water from Earth's surface into the sky where water vapour forms clouds

Study the evaporation process of water from Earth's surface into the sky where water vapour forms clouds

Watch an animation of an aquatic dragonfly larva extending its labial mask to catch prey

Watch an animation of an aquatic dragonfly larva extending its labial mask to catch prey

Learn how DNA thermal cycler employs polymerase chain reaction to copy DNA strands

Learn how DNA thermal cycler employs polymerase chain reaction to copy DNA strands

Observe how radiation from atomic bombs and nuclear disasters remains a major environmental concern

Observe how radiation from atomic bombs and nuclear disasters remains a major environmental concern

Discern the difference between frequency and amplitude by studying sound waves

Discern the difference between frequency and amplitude by studying sound waves

Learn about the successes and failures of the U.S. space shuttle program and the cost of space exploration

Learn about the successes and failures of the U.S. space shuttle program and the cost of space exploration

Observe a trumpeter swan care for cygnets in their nest and marsh-grass habitat

Observe a trumpeter swan care for cygnets in their nest and marsh-grass habitat

Discover how Galapagos finches underwent adaptive radiation and aided Darwin in his theory of evolution

Discover how Galapagos finches underwent adaptive radiation and aided Darwin in his theory of evolution

Witness the praying mantis's predatory feeding habits and learn about the insect's sexual cannibalism

Witness the praying mantis's predatory feeding habits and learn about the insect's sexual cannibalism

Classify newly formed snow crystals as fernlike stellar dendrites, columns, or needles

Classify newly formed snow crystals as fernlike stellar dendrites, columns, or needles

Learn how flowers use secreted nectar, scent, and appearance to attract cross-pollinating bees

Learn how flowers use secreted nectar, scent, and appearance to attract cross-pollinating bees

$Discover diffraction as a property of sound, electromagnetic radiation, and small moving particles$

Discover diffraction as a property of sound, electromagnetic radiation, and small moving particles

Examine what separates mushrooms, mildews, molds, and yeasts from the plant and animal kingdoms

Examine what separates mushrooms, mildews, molds, and yeasts from the plant and animal kingdoms

Behold the multitude of Amazonian arthropods including spiders, scorpions, beetles, and mantids

Behold the multitude of Amazonian arthropods including spiders, scorpions, beetles, and mantids

Investigate vegetation unique to cloud forests atop tepui and lowland rainforests in Guiana Highlands region

Investigate vegetation unique to cloud forests atop tepui and lowland rainforests in Guiana Highlands region

Observe the meiotic reproduction of a diploid cell into four haploid gametes

Observe the meiotic reproduction of a diploid cell into four haploid gametes

Learn how purple sulfur bacteria photosynthesize sans oxygen and how myxobacteria decompose forest material

Learn how purple sulfur bacteria photosynthesize sans oxygen and how myxobacteria decompose forest material

Study an amphibious tiger salamander of the mole salamander family Ambystomatidae in its natural habitat

Study an amphibious tiger salamander of the mole salamander family Ambystomatidae in its natural habitat

Glimpse the Amazon Rainforest's diverse wildlife, from anacondas and sloths to macaws and capybaras

Glimpse the Amazon Rainforest's diverse wildlife, from anacondas and sloths to macaws and capybaras

Why are children slightly different from their parents?

Why are children slightly different from their parents?

Witness snowflake crystals created in a laboratory environment

Witness snowflake crystals created in a laboratory environment

See the black skimmer water bird skim the calm surface with its longer lower mandible in search of prey

See the black skimmer water bird skim the calm surface with its longer lower mandible in search of prey

Study the life cycle and fossilization of Carcharocles megalodon from the Miocene and Pliocene epochs

Study the life cycle and fossilization of Carcharocles megalodon from the Miocene and Pliocene epochs

Discover the International Astronomical Union's naming schemes for features on Pluto and its moons

Discover the International Astronomical Union's naming schemes for features on Pluto and its moons

Watch red blood cells travel through arteries and capillaries to deliver oxygen

Watch red blood cells travel through arteries and capillaries to deliver oxygen

Learn how the world's largest rodent escapes jaguars, anacondas, and human predators

Learn how the world's largest rodent escapes jaguars, anacondas, and human predators

Realize the contributions of Mary Somerville to the fields of astronomy, geography, physics, and meteorology

Realize the contributions of Mary Somerville to the fields of astronomy, geography, physics, and meteorology

Explore heat transfer and know the difference between heat and temperature

Explore heat transfer and know the difference between heat and temperature

Find out what an organism is and consider which one is the world's smallest

Find out what an organism is and consider which one is the world's smallest

Understand how cell membranes regulate food consumption and waste and how cell walls provide protection

Understand how cell membranes regulate food consumption and waste and how cell walls provide protection

Study a prairie dog colony, breeding habits, and response to predators in the North American plains

Study a prairie dog colony, breeding habits, and response to predators in the North American plains

Analyze how light affects plants' uptake of carbon dioxide and emission of oxygen

Analyze how light affects plants' uptake of carbon dioxide and emission of oxygen

Watch a suspended vibrating spring to learn about the propagation of sound waves

Watch a suspended vibrating spring to learn about the propagation of sound waves

Examine habits of lemmings and dangers they face during migration, such as predation, starvation, and accidents

Examine habits of lemmings and dangers they face during migration, such as predation, starvation, and accidents

Encounter some of the 20,000 legume species from vines and trees to shrubs and herbs

Encounter some of the 20,000 legume species from vines and trees to shrubs and herbs

Delve into a chloroplast's stroma to watch adenosine triphosphate provide energy for sugar-producing reactions

Delve into a chloroplast's stroma to watch adenosine triphosphate provide energy for sugar-producing reactions

See how differing amounts of solar radiation at the poles and Equator affect Earth's climate and atmosphere

See how differing amounts of solar radiation at the poles and Equator affect Earth's climate and atmosphere

Learn about the various forms of asexual plant reproduction; bulb, gemma, plantlet, and cutting

Learn about the various forms of asexual plant reproduction; bulb, gemma, plantlet, and cutting

Examine a rag worm crawling in sand and a close-up of its gills

Examine a rag worm crawling in sand and a close-up of its gills

Understand the importance and role of chloroplasts, chlorophyll, grana, thylakoid membranes, and stroma in photosynthesis

Understand the importance and role of chloroplasts, chlorophyll, grana, thylakoid membranes, and stroma in photosynthesis

Study a jellyfish's muscular contractions and learn how the carnivore uses its tentacles to catch prey

Study a jellyfish's muscular contractions and learn how the carnivore uses its tentacles to catch prey

Learn about the explosion of a possible comet or asteroid over the Siberian taiga

Learn about the explosion of a possible comet or asteroid over the Siberian taiga

Study adaptations evolved by bryophytic mosses, hornworts, and liverworts and those of vascular angiosperms

Study adaptations evolved by bryophytic mosses, hornworts, and liverworts and those of vascular angiosperms

Long-term data sets reveal increased concentrations of the greenhouse gas carbon dioxide in Earth's atmosphere

Long-term data sets reveal increased concentrations of the greenhouse gas carbon dioxide in Earth's atmosphere

Learn about the bacteria of the human body and examine the role of sweat glands in the immune system

Learn about the bacteria of the human body and examine the role of sweat glands in the immune system

Study how spiders' prodigious predation of herbivorous insects protects plant life

Study how spiders' prodigious predation of herbivorous insects protects plant life

Explore the adaptions of ray-finned fish species such as seahorses, filefish, jawfish, pipefish, and boxfish

Explore the adaptions of ray-finned fish species such as seahorses, filefish, jawfish, pipefish, and boxfish

Diagram stars, planets, constellations, and other heavenly bodies by understanding Earth's celestial sphere

Diagram stars, planets, constellations, and other heavenly bodies by understanding Earth's celestial sphere

Observe the action of a magnetic field and interactions between magnetic poles

Observe the action of a magnetic field and interactions between magnetic poles

Examine stained images distinguishing phagocytes from bacteria during phagocytosis

Examine stained images distinguishing phagocytes from bacteria during phagocytosis

See how Edwin Hubble, Georges Lemaître, Arno Penzias, and Robert Wilson contributed to the big-bang model

See how Edwin Hubble, Georges Lemaître, Arno Penzias, and Robert Wilson contributed to the big-bang model

Examine the role of sunlight and gravity in phototropic and geotropic plant growth

Examine the role of sunlight and gravity in phototropic and geotropic plant growth

Discover how hat-thrower fungi species fling sporangia to be consumed by grazing cows and horses

Discover how hat-thrower fungi species fling sporangia to be consumed by grazing cows and horses

Listen to a humpback whale pod communicate via underwater “songs”

Listen to a humpback whale pod communicate via underwater “songs”

See how sea creatures have evolved different adaptations to both catch prey and avoid becoming prey

See how sea creatures have evolved different adaptations to both catch prey and avoid becoming prey

Learn how the Richter scale relies on vibration to logarithmically track earth tremors

Learn how the Richter scale relies on vibration to logarithmically track earth tremors

Take a microscopic look at how a eukaryotic flagellate's flagellum propels the organism through water

Take a microscopic look at how a eukaryotic flagellate's flagellum propels the organism through water

Watch a Gila monster raid a nest for eggs

Watch a Gila monster raid a nest for eggs

Observe subadult cypris and adult barnacles using cirri retractile organs to collect food particles

Observe subadult cypris and adult barnacles using cirri retractile organs to collect food particles

What's the difference between weather and climate?

What's the difference between weather and climate?

Learn about platypus venom and why studying it may reveal new ways to manage pain in humans

Learn about platypus venom and why studying it may reveal new ways to manage pain in humans

Watch: A total solar eclipse

Watch: A total solar eclipse

Discover how ecotourism at Monteverde Cloud Forest Biological Reserve aids conservation

Discover how ecotourism at Monteverde Cloud Forest Biological Reserve aids conservation

Observe a predatory lion pride in a typical day of grooming, playing, hunting and eating prey, and sleeping

Observe a predatory lion pride in a typical day of grooming, playing, hunting and eating prey, and sleeping

Visit Aymara and Quechua people on the Altiplano of Bolivia and Peru to see the ancient drop-spindle technique

Visit Aymara and Quechua people on the Altiplano of Bolivia and Peru to see the ancient drop-spindle technique

Use the Punnett square to track dominant and recessive allele pairings that make up a trait's genotype

Use the Punnett square to track dominant and recessive allele pairings that make up a trait's genotype

Spot the Andean condor soaring among the Andes mountaintops and note its impressive wingspan

Spot the Andean condor soaring among the Andes mountaintops and note its impressive wingspan

Examine the application of Werner Heisenberg's uncertainty principle of subatomic particles

Examine the application of Werner Heisenberg's uncertainty principle of subatomic particles

Examine the structures adenine, ribose, and a three-phosphate chain in adenosine triphosphate molecule and their role in releasing energy for cellular activities

Examine the structures adenine, ribose, and a three-phosphate chain in adenosine triphosphate molecule and their role in releasing energy for cellular activities

Learn about P waves, S waves, Love waves, and Rayleigh waves generated by an earthquake

Learn about P waves, S waves, Love waves, and Rayleigh waves generated by an earthquake

Buoyancy, gravity, density, and water displacement explained

Buoyancy, gravity, density, and water displacement explained

See how Earth's constant axial tilt and yearly revolution around the Sun cause seasons

See how Earth's constant axial tilt and yearly revolution around the Sun cause seasons

Observe a quill-bearing North American rodent ambling and eating in its natural habitat

Observe a quill-bearing North American rodent ambling and eating in its natural habitat

Watch a velvet worm, an ancient terrestrial invertebrate, crawl across leaf litter

Watch a velvet worm, an ancient terrestrial invertebrate, crawl across leaf litter

Examine the habitat and life cycle of the lungless red salamander amphibian from the Plethodontidae family

Examine the habitat and life cycle of the lungless red salamander amphibian from the Plethodontidae family

Study the North American toad's projectile tongue in real time and slow motion as it catches insect prey

Study the North American toad's projectile tongue in real time and slow motion as it catches insect prey

Examine metagenesis and the roles of antheridia, archegonia, and the sporangium in the moss Mnium hornum

Examine metagenesis and the roles of antheridia, archegonia, and the sporangium in the moss Mnium hornum

Track the discovery of dinosaurs from 7th-century griffin legends to Richard Owen's coining of Dinosauria

Track the discovery of dinosaurs from 7th-century griffin legends to Richard Owen's coining of Dinosauria

Witness a group of mushrooms growing underwater and revealing gills on their caps' undersides

Witness a group of mushrooms growing underwater and revealing gills on their caps' undersides

Study the habits of amoebae, vorticellas, paramecium, and other protozoans under a microscope

Study the habits of amoebae, vorticellas, paramecium, and other protozoans under a microscope

Observe a brindled gnu herd migrating and grazing followed by zebras, crowned cranes, lions, and hyenas

Observe a brindled gnu herd migrating and grazing followed by zebras, crowned cranes, lions, and hyenas

Investigate how honeybees construct combs out of wax to store honey, plant nectar, and bee bread

Investigate how honeybees construct combs out of wax to store honey, plant nectar, and bee bread

See how John Dalton built his atomic theory on principles laid out by Henry Cavendish and Joseph-Louis Proust

See how John Dalton built his atomic theory on principles laid out by Henry Cavendish and Joseph-Louis Proust

Watch a desert thunderstorm and resulting flash flood scour the sandy soil and terrain

Watch a desert thunderstorm and resulting flash flood scour the sandy soil and terrain

Learn how scientists use time-lapse photography to track movement and flow of glaciers

Learn how scientists use time-lapse photography to track movement and flow of glaciers

Examine evolved differences between Galapagos tortoises across Galapagos Islands

Examine evolved differences between Galapagos tortoises across Galapagos Islands

Analyze the structure and motion of cilia and flagella

Analyze the structure and motion of cilia and flagella

Learn how Austrian Catholic monk and botanist Gregor Mendel observed properties of heredity

Learn how Austrian Catholic monk and botanist Gregor Mendel observed properties of heredity

See time-lapse microphotography of blastomeres created by mitotic cleavage of embryonic cells

See time-lapse microphotography of blastomeres created by mitotic cleavage of embryonic cells

Observe a female black pilot snake hatch a clutch of eggs and a newborn use its egg tooth to hatch

Observe a female black pilot snake hatch a clutch of eggs and a newborn use its egg tooth to hatch

Watch a banded sand snake seem to swim under sand and a sidewinder snake sidewinding across the desert floor

Watch a banded sand snake seem to swim under sand and a sidewinder snake sidewinding across the desert floor

Watch clouds form over the Pacific Ocean and waterfalls pour down Mount Waialeale on the Hawaiian island of Kauai

Watch clouds form over the Pacific Ocean and waterfalls pour down Mount Waialeale on the Hawaiian island of Kauai

Observe chimpanzees' social interactions in their rainforest, grassland, and woodland habitats

Observe chimpanzees' social interactions in their rainforest, grassland, and woodland habitats

Observe flamingo flight, flocking, and feeding behaviours

Observe flamingo flight, flocking, and feeding behaviours

See how Nicolaus Copernicus's heliocentric model replaced Aristotle's and Ptolemy's geocentric models

See how Nicolaus Copernicus's heliocentric model replaced Aristotle's and Ptolemy's geocentric models

Understand the spatial relationships between the Sun, the Moon, and Earth during eclipses

Understand the spatial relationships between the Sun, the Moon, and Earth during eclipses

Observe a herd of African savanna elephants forage for food, self-groom, and enjoy a watering hole

Observe a herd of African savanna elephants forage for food, self-groom, and enjoy a watering hole

Discover how the pilot black snake utilizes its ventral scales to glide through water, land, and trees

Discover how the pilot black snake utilizes its ventral scales to glide through water, land, and trees

Solar and lunar eclipses, explained

Solar and lunar eclipses, explained

See a golden eagle take flight from its nest to swoop down on rabbit prey

See a golden eagle take flight from its nest to swoop down on rabbit prey

Discover penguin habitats from the Galapagos Islands near the Equator to Antarctica

Discover penguin habitats from the Galapagos Islands near the Equator to Antarctica

See how diversity of cichlid species in Lake Nyasa compares with finch diversity in the Galapagos Islands

See how diversity of cichlid species in Lake Nyasa compares with finch diversity in the Galapagos Islands

Observe a giant anteater using its long muzzle and wormlike tongue to eat and drink

Observe a giant anteater using its long muzzle and wormlike tongue to eat and drink

Examine bipedal biomechanics through a skeletal view of a tyrannosaur's stride

Examine bipedal biomechanics through a skeletal view of a tyrannosaur's stride

Study the roles of a fish's scales, swim bladder, and gills in its respiratory system

Study the roles of a fish's scales, swim bladder, and gills in its respiratory system

Learn about solar-system theories by Aristotle, Ptolemy, Nicolaus Copernicus, and Johannes Kepler

Learn about solar-system theories by Aristotle, Ptolemy, Nicolaus Copernicus, and Johannes Kepler

Learn how igneous, sedimentary, and metamorphic rock become one another in the rock cycle

Learn how igneous, sedimentary, and metamorphic rock become one another in the rock cycle

Watch a North American raccoon sift for aquatic prey, using its keen sense of touch

Watch a North American raccoon sift for aquatic prey, using its keen sense of touch

Glimpse the diversity of plant evolution that provides food and habitats for other life to thrive

Glimpse the diversity of plant evolution that provides food and habitats for other life to thrive

Discover how glucose and oxygen produced during photosynthesis in plants helps during respiration in animals

Discover how glucose and oxygen produced during photosynthesis in plants helps during respiration in animals

Compare Homo habilis, H. erectus, H. neanderthalensis, and H. sapiens to determine the first human species

Compare Homo habilis, H. erectus, H. neanderthalensis, and H. sapiens to determine the first human species

Witness a living plant cell's chromosomes carrying genetic material duplicate during the process of mitosis

Witness a living plant cell's chromosomes carrying genetic material duplicate during the process of mitosis

See how cloud formation near a low-pressure system or ongoing tropical storm fuels a hurricane

See how cloud formation near a low-pressure system or ongoing tropical storm fuels a hurricane

S waves travel through an elastic medium in curved paths and shear the medium in one direction and then another

S waves travel through an elastic medium in curved paths and shear the medium in one direction and then another

Learn how deforestation in Central American countries like Belize gives way to erosion and poverty

Learn how deforestation in Central American countries like Belize gives way to erosion and poverty

Study how the Sun's gravitational pull keeps Earth in a nearly circular orbit

Study how the Sun's gravitational pull keeps Earth in a nearly circular orbit