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Blastomycosis is often misdiagnosed, resulting in tragic outcomes. It is caused by a fungus living in moist soil, in wooded areas of the United States and Canada. If inhaled, the fungus can cause mild breathing problems that may worsen and cause serious illness and even death.

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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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There are 60,000 miles of blood vessels in every adult human.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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