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From DNA matching to tracking technology, this report reveals how science aided in bringing down the master terrorist [More]

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.