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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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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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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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).