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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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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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Colchicine is a highly poisonous alkaloid originally extracted from a type of saffron plant that is used mainly to treat gout.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.