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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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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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The average adult has about 21 square feet of skin.
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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.