Scientists have discovered DNA has a half-life of 521 years, which means it’s completely decayed within 6.8 million years of an organism’s death. What’s more, readable amounts only exist in ... more 
Scientists have discovered DNA has a half-life of 521 years, which means it’s completely decayed within 6.8 million years of an organism’s death. What’s more, readable amounts only exist in fossils for some 1.5 million years. less 
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Tue, Oct 16, 2012 5:38 AM EDT