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You could win $20,000 to put it into action. Take part in the Green Effect, a new initiative from SunChips and National Geographic to inspire people to take small steps for big change.
Sunday, July 5, 2009 |
Photo: Leap Year: How the World Makes Up for Lost TimeJulius instituted the so-called Julian calendar, which reorganized Rome's 12 months into a 365-day year with a leap year every four years. That system became the predecessor to the Gregorian Calendar, which is now used throughout the Western world. Photograph by Heribert Proepper/AP
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ADVERTISEMENTNATIONAL GEOGRAPHIC'S PHOTO OF THE DAYWhat's Your Green Idea?
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