Why are so many things broken? In a hilarious talk from the 2006 Gel conference, Seth Godin gives a tour of things poorly designed, the 7 reasons why they are that way, and how to fix them.

Seth Godin argues the Internet has ended mass marketing and revived a human social unit from the distant past: tribes. Founded on shared ideas and values, tribes give ordinary people the power to lead and make big change. He urges us to do so.

In a world of too many options and too little time, our obvious choice is to just ignore the ordinary stuff. Marketing guru Seth Godin spells out why, when it comes to getting our attention, bad or bizarre ideas are more successful than boring ones.

The SETI Institute's Jill Tarter makes her TED Prize wish: to accelerate our search for cosmic company. Using a growing array of radio telescopes, she and her team listen for patterns that may be a sign of intelligence elsewhere in the universe.

Jacqueline Novogratz applauds the world's heightened interest in Africa and poverty, but argues persuasively for a new approach.