The Colombian pop star's latest album, She Wolf, is out in November. Shakira will now take your questions
He got his first skateboard at 8 years old, and was competing as a professional by the age of 14. Nicknamed the "Birdman" for his vertical feats, Hawk has a new video game, Ride, out Nov. 17. Tony Hawk will now take your questions
After his portrayal of a drug-addict in Trainspotting, the British actor became a Hollywood star with three Star Wars movies. His new film The Men Who Stare At Goats, is out Nov. 6. Ewan McGregor will now take your questions
Michigan's Canadian-born governor on her state's challenges. Jennifer Granholm will now take your questions
The 30 Rock star discusses comedy and his new memoir, I Am the New Black
The Nobel Prize-winning microcredit guru believes in a poverty-free world. Muhammad Yunus will now take your questions
The former U.N. head is campaigning for a climate-change deal. Kofi Annan will now take your questions
His documentary The National Parks: America's Best Idea debuts Sept. 27 on PBS. Ken Burns will now take your questions
The Congressman and libertarian activist has a new book, End the Fed. Ron Paul will now take your questions
The primatologist's new book, Hope for Animals and Their World, is out now. Jane Goodall will now take your questions
The Emmy-winning Jeopardy! host celebrates 25 years on the air. Alex Trebek will now take your questions
America's top tennis player takes the court at the U.S. Open on Aug. 31. Andy Roddick will now take your questions