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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.