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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
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In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.