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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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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The average adult has about 21 square feet of skin.
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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.