There are 20 feet of blood vessels in each square inch of human skin.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Your heart beats over 36 million times a year.
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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.