Why we love, why we cheat | Helen Fisher

Finding happiness in body and soul | Eve Ensler

The freakonomics of McDonalds vs. drugs | Steven Levitt

David Deutsch: Chemical scum that dream of distant quasars

Why the universe seems so strange | Richard Dawkins

The paradox of choice | Barry Schwartz | TED

Choice, happiness and spaghetti sauce | Malcolm Gladwell

Eva Vertes: My dream about the future of medicine

Why are we happy? Why aren't we happy? | Dan Gilbert

A roadmap to end aging | Aubrey de Grey

Jacqueline Novogratz: Investing in Africa's own solutions

Hans Rosling: Debunking third-world myths with the best stats you've ever seen

Ashraf Ghani: How to fix broken states

Ben Saunders: Three things to know before you ski to the North Pole

Burt Rutan: Entrepreneurs are the future of space flight

The accelerating power of technology | Ray Kurzweil

Kevin Kelly: How technology evolves

Phil Borges: Documenting our endangered cultures

Bjorn Lomborg: Global priorities bigger than climate change

Wade Davis: Cultures at the far edge of the world

Do schools kill creativity? | Sir Ken Robinson | TED

Majora Carter: Greening the ghetto | TED

Dean Ornish: The world's killer diet

Secrets of success in 8 words, 3 minutes | Richard St. John

If I controlled the Internet | Rives