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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
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Thyroid conditions may make getting pregnant impossible.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.