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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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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.