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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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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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There are more sensory neurons in the tongue than in any other part of the body.
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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.