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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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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.
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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.