Ai Weiwei: 'Life is never guaranteed to be safe'
Ai Weiwei, the Chinese artist who will soon take over Tate Modern's Turbine Hall, on why he wants to tell people that it's OK to speak out.
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Mary Roach: 10 Things You Didn't Know About Orgasm
Author Mary Roach delves into obscure scientific research, some of it centuries old, to make 10 surprising claims about sexual climax, ranging from the bizarre to the hilarious.
Hannah Brencher: Love Letters to Strangers
Hannah Brencher's mother always wrote her letters. So when she felt herself bottom into depression after college, she did what felt natural -- she wrote love letters and left them for strangers to find. The act has become a global initiative, The World Needs More Love Letters, which rushes handwritten letters to those in need of a boost.
The Remarkable Story of Ernestine Shepherd
Do healthy, ripped bodies only belong to the young? Not if you're Ernestine Shepherd. At 77, she's the world's oldest female bodybuilder and in our original documentary short, we follow a day in her life.
Seth Shostak: ET is (Probably) Out There -- Get Ready
Dr. Seth Shostak participates in the search for extraterrestrial life at the SETI Institute. He believes ET is out there, and there is a good chance we will discover him soon.
The Power of Affirmation (The EPOD Theory)
A live, high-energy presentation performed by Dave Yoho debunks the myth that good talkers make great salespeople. It shows how managers get salespeople to talk less, listen more, understand customers better, and - sell more.