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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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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Cyanide works by making the human body unable to use oxygen.
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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.