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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The human body produces and destroys 15 million blood cells every second.
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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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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.