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.
More » Source: http://feeds.gawker.com/~r/gizmodo/full/~3/6owD8ciRKNw/how-greenhouse-gasses-made-life-on-earth-possible
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