The Sahara desert was a green savanna as recently as 5,000 years ago.
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More Human Body Facts
Some animals can regenerate entire body parts.
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The wheel is one of the earliest human inventions.
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In 1920, a town in Minnesota briefly elected a bear as mayor in a publicity stunt.
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Cats can rotate their ears independently.
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A giraffe's heart can weigh over 20 pounds.
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A blue whale's heart can weigh over 400 pounds.
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In 2001, a Norwegian man survived a fall through ice by floating in near-freezing water.
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The human eye can detect a single photon.
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