The adult human brain weighs about 3 pounds (1,300-1,400 g).
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One human hair can support 3 ounces.
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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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All the chemicals in a human body combined are worth about 6.25 euro (if sold separately).
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Chewing gum boosts your brain power.
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Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
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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.
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