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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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There are more sensory neurons in the tongue than in any other part of the body.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.