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As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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Cyanide works by making the human body unable to use oxygen.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

Areas of Referred Pain, Posterior View Areas of Referred Pain, Posterior View
(A) The nine regions of the abdominopelvic cavity. (B) The four regions of the abdomen, which are re (A) The nine regions of the abdominopelvic cavity. (B) The four regions of the abdomen, which are re
Areas of referred pain; A, anterior view; B, posterior view. Areas of referred pain; A, anterior view; B, posterior view.
Various sites of referred pain. Various sites of referred pain.
Sites of referred pain Sites of referred pain
Video: Photosynthesis overview Animation

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