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Your heart beats over 36 million times a year.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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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.