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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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There are more sensory neurons in the tongue than in any other part of the body.
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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."