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Vaccines prevent between 2.5 and 4 million deaths every year.
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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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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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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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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.