Sloths take two weeks to digest their food.
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There is a family with a genetic condition that makes their skin blue, who have been isolated in rural Kentucky for generations.
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In 2007, a Bosnian couple found out that they had been cheating on one another in online chatrooms... with each other.
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It 'snows' metal on Venus.
13
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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