Who do you want to see receive $20,000 to put their Earth-saving idea into action? Check out the ten Green Effect finalists, and until July 20 you can vote—up to once a day—for your favorite idea!
Monday, July 6, 2009 |
Monday, July 6, 2009 |
Photo: Pre-Inca Observatory Is Oldest in Americas, Study SaysThe 2,300-year-old Chankillo site includes a walled temple with a building that includes a 131-foot-long (40-meter-long) corridor. The mouth of the corridor is the ideal vantage point, the scientists say, for viewing the way the towers mark the points where the sun rises and sets at various times of the year. Photograph courtesy Ivan Ghezzi
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ADVERTISEMENTNATIONAL GEOGRAPHIC'S PHOTO OF THE DAY |
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