Your blood vessels, if laid end to end, would circle the Earth about 2.5 times.
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The human body can survive about 3 days without water.
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There are more lifeforms living in your body than human cells.
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Your stomach lining replaces itself every few days.
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The human body produces red blood cells in bone marrow.
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Roughly 60% of your body weight is water.
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The human jaw is the fastest-healing part of the body.
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The human body produces heat through metabolism.
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Your brain enables existence.
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