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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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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There are 20 feet of blood vessels in each square inch of human skin.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.