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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.