Octopuses have three hearts — two pump blood to the gills, one to the rest of the body.
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Ankylosaurus had a heavily armored body and a clubbed tail.
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There are more possible shuffles of a deck of cards than seconds since Earth formed.
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The fennec fox has large ears that help dissipate heat.
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Some fish can survive in near-freezing water.
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The human eye can distinguish millions of colors.
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A grizzly bear can run surprisingly fast over short distances.
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In 1953, Watson and Crick described the double-helix structure of DNA.
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The Human Genome Project mapped the entire human genetic sequence.
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