Dan Gilbert says we're not great at predicting how much we will enjoy an experience in part because we fail to consider all of the details. We think a visit to the dentist will be terrible, but we're forgetting about the free toothbrush, the nice chat with the dental hygienist and the magazines in the waiting room. Peter Macdiarmid/Getty Images hide caption

Every time you give in to your phone or computer that's buzzing with notifications, you pay a price: little by little, you lose your ability to focus. Veronica Grech/Getty Images/Ikon Images hide caption

Researchers say there's growing evidence that nature has a powerful effect on us, improving both our physical and psychological health. Angela Hsieh hide caption

Scarcity can make it difficult for us to focus on anything other than the problem right in front of us. Gary Waters /Getty Images/Ikon Images hide caption