Scientists have painstakingly measured 2.7 billion-year-old raindrop fossils from South Africa. The size of the ancient droplets tells the story of how the earth was teeming with microbes when it should have been frozen solid.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/6owD8ciRKNw/how-greenhouse-gasses-made-life-on-earth-possible
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