Richard St. John: "Success is a continuous journey"

Al Gore: Alarming new slides of the worsening climate crisis

Jacqueline Novogratz on an escape from poverty

Dan Dennett: Cute, sexy, sweet, funny

Unveiling game-changing wearable tech | Pattie Maes

James Burchfield: Sound stylings by a human beatbox

Laura Trice: The power of saying thank you

Adam Grosser: A mobile fridge for vaccines

Militant atheism | Richard Dawkins

Ngozi Okonjo-Iweala: How to help Africa? Do business there

New thinking on the climate crisis | Al Gore

My stroke of insight | Jill Bolte Taylor | TED

Blaise Aguera y Arcas: Jaw-dropping Photosynth demo

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

Wade Davis: Cultures at the far edge of the world

Do schools kill creativity? | Sir Ken Robinson | TED

Majora Carter: Greening the ghetto | TED

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