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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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There are 20 feet of blood vessels in each square inch of human skin.
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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
![Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_20_12_100441848.jpeg)
![At breakfast, a middle-class husband sits absorbed in the newspaper and the public affairs of the da](https://biology-forums.com/gallery/47/medium_6_24_08_15_12_36_52_224132038.jpeg)