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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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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In 1844, Charles Goodyear obtained the first patent for a rubber condom.