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Melinda Gates and Bill Gates Why giving away our wealth has been the most satisfying thing we've done In 1993, Bill and Melinda Gates—then engaged—took a walk on a beach in Zanzibar, and made a bold decision on how they would make sure that their wealth from Microsoft went back into society. In a conversation with Chris Anderson, the couple talks about their work at the Bill & Melinda Gates Foundation, as well as about their marriage, their children, their failures and the satisfaction of giving most of their wealth away.

TED

TED
What drove David Sengeh to create a more comfortable prosthetic limb? He grew up in Sierra Leone, and too many of the people he loves are missing limbs after the brutal civil war there. When he noticed that people who had prosthetics weren't actually wearing them, he set out to discover why — and to solve the problem with his team from the MIT Media Lab. TEDTalks is a daily video podcast of the best talks and performances from the TED Conference, where the world's leading thinkers and doers give the talk of their lives in 18 minutes (or less).

TED

TED

EDU

EDU MIT Understanding Lasers and Fiberoptics full course by MIT Lasers are essential to an incredibly large number of applications. Today, they are used in bar code readers, compact discs, medicine, communications, sensors, materials processing, computer printers, data processing, 3D-imaging, spectroscopy, navigation, non-destructive testing, chemical processing, color copiers, laser "shows", and in the military. There is hardly a field untouched by the laser. But what exactly is so unique about lasers that makes them so effective?