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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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There are 20 feet of blood vessels in each square inch of human skin.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.