William Kamkwamba on building a windmill

Marcin Jakubowski: Open-sourced blueprints for civilization

Arvind Gupta: Turning trash into toys for learning

John Hardy: My green school dream

Dave Eggers' wish: Once Upon a School

Gever Tulley 5 dangerous things you should let your kids do

Steven Levitt analyzes crack economics

Dan Dennett: Cute, sexy, sweet, funny

Hans Rosling's new insights on poverty

Steven Pinker on the myth of violence

Jonathan Haidt on the moral roots of liberals and conservatives

Dan Ariely on our buggy moral code

Dan Ariely asks, Are we in control of our own decisions?

Dan Pink on the surprising science of motivation

Investigating a Worthwhile Life

The Three A's of Awesome from TED Talks