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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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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.
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Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.
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Illicit drug use costs the United States approximately $181 billion every year.
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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.
![The nitrogen cycle. Numbers represent fluxes as 1012 g N per year (data from Schlesinger 1991, after](https://biology-forums.com/gallery/47/medium_33_17_02_12_7_02_17_2038129.jpeg)
![Pneumonia. This common lung inflammation may be caused by bacteria, viruses, or fungi and is often d](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_23_11_100542416.jpeg)