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Time is running out to register for Innovation Uncensored in San Francisco. We're only three weeks away and we're excited! Can you blame us? The CEOs of eBay, Ticketmaster, SolarCity, craigslist, Virgin America, Startup America Partnership, Erly, Livestrong, and Path are coming.

NATIONAL HARBOR, Md.--Silicon translates sunshine into electricity--and Earth receives enough sunshine in a daylight hour to supply all of humanity's energy needs for a year. But despite being as common as sand, photovoltaic panels made from silicon--or any of a host of other semiconducting materials --are not cheap, especially when compared with the cost of electricity produced by burning coal or natural gas.