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Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.

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Thyroid conditions may make getting pregnant impossible.

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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.

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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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