There are more possible variations of DNA than people who have ever lived.
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Hippopotamuses secrete a reddish fluid that helps protect their skin.
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The human heart beats over 100,000 times per day on average.
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The first artificial heart was implanted in the 1980s.
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The human brain contains roughly 86 billion neurons.
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Learning involves changes in neural connections.
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Octopuses have three hearts and blue blood.
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The invention of dialysis allows patients with kidney failure to survive.
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The Earth's outer core is liquid metal.
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