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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.