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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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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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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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The horizontal fraction bar was introduced by the Arabs.