The human brain has the capacity to store everything that you experience.
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Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
The human body contains over a billion miles of DNA.
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Every year your body replaces 98% of your atoms.
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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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It takes about 20 seconds for a red blood cell to circle the whole body.
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