Your blood vessels, if uncoiled, would stretch 100,000 km — enough to circle Earth 2.5 times.
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A hyena’s jaw is powerful enough to crush bone.
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The human body produces heat through metabolism.
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The first successful human heart transplant was performed in 1967.
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Early humans hunted megafauna during the Ice Age.
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Your stomach replaces itself every few days.
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In 1953, Watson and Crick described the double-helix structure of DNA.
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