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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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There are more sensory neurons in the tongue than in any other part of the body.
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There are 60,000 miles of blood vessels in every adult human.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.