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Scoop.it!
When Sifrhippus, the earliest known horse, first appeared in the forests of North America more than 50 million years ago, it would not have been mistaken for a Clydesdale. 
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Scoop.it!
Married people may pledge to stay faithful through good times and bad, but birds sing a different tune -- when weather is severe or uncertain, birds are more likely to stray from their mates, says a new study.
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