Turning wild ideas into new energy technologies

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Before every new technology there comes the moment of invention. Before there was ethanol, someone had to look at biomass and say, "There's energy in them thar leaves." For the last day of our Power Trip energy series, venture capitalist Vinod Khosla joins The Takeaway from the TED conference in Long Beach, California. Khosla, whose company risks millions of dollars every year to fund upstart energy technologies, ruminates on creating billion dollar industries out of wild ideas.

Bill Gates, Microsoft founder and philanthropist, addressed the crowd at this year's TED conference with his thoughts on saving the world with a new kind of philanthropy. It's long, but funny. Really.