Some animals sleep for years.
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The Human Genome Project mapped the entire human genetic sequence.
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The average adult human has 32 teeth.
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Hippopotamuses secrete a reddish fluid that helps protect their skin.
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The vaccination syringe improved medical delivery methods.
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The saber-toothed cat went extinct around 10,000 years ago.
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Dust storms can reduce visibility to near zero.
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The human liver can regenerate lost tissue.
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The human skin is the body's largest organ.
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