More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
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The colossal squid has the largest eyes in the world.
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Between 2007 and 2012, Bill Gates gave away $28 billion; saving 6 million lives.
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Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
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