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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.