Dr. Tal Ben-Shahar, who taught one of Harvard University's most popular classes, combines scientific studies, scholarly research, self-help advice and spiritual enlightenment to teach viewers how to learn to be happy.

Mark Applebaum writes music that breaks the rules in fantastic ways, composing a concerto for a florist and crafting a musical instrument from junk and found objects. This quirky talk might just inspire you to shake up the "rules" of your own creative work.

Alberto Cairo's clinics in Afghanistan used to close down during active fighting. Now, they stay open. Cairo tells the powerful story of why -- and how he found humanity and dignity in the midst of war.

Péter Fankhauser demonstrates Rezero, a robot that balances on a ball. Designed and built by a group of engineering students, Rezero is the first ballbot made to move quickly and gracefully -- and even dance.