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Your heart beats over 36 million times a year.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
There are more sensory neurons in the tongue than in any other part of the body.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
The human body produces and destroys 15 million blood cells every second.
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