What I worry about, what I'm excited about: Bill Joy on TED.com

Technologist and futurist Bill Joy shares several big worries for humanity -- and several big hopes in the fields of health, education and future tech. (Recorded February 2006 in Monterey, California. Duration: 19:02.)

A meditation on hope: Sherwin Nuland on TED.com

Surgeon and writer Sherwin Nuland meditates on the idea of hope -- the desire to become our better selves and make a better world. In a thoughtful 12 minutes, he explores the connection between "hope" and "change" -- a fitting talk to end this week full of both. (Recorded February 2003 in Monterey, California. Duration: 12:37.)

Dan Gilbert: Exploring the frontiers of happiness

About this talk
Dan Gilbert presents research and data from his exploration of happiness -- sharing some surprising tests and experiments that you can also try on yourself. Watch through to the end for a sparkling Q&A with some familiar TED faces.
About Dan Gilbert
Harvard psychologist Dan Gilbert says our beliefs about what will make us happy are often wrong -- a premise he supports with intriguing research

Benjamin Wallace: Does happiness have a price tag?

About this talk
Can happiness be bought? To find out, author Benjamin Wallace sampled the world's most expensive products, including a bottle of 1947 Chateau Cheval Blanc, 8 ounces of Kobe beef and the fabled (notorious) Kopi Luwak coffee. His critique may surprise you.
About Benjamin Wallace
Benjamin Wallace is a journalist and author of The Billionaire's Vinegar, the true story of the world's most expensive bottle of (possibly phony?) wine. He's been a contributor to GQ,