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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.
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.
Chronic necrotizing aspergillosis has a slowly progressive process that, unlike invasive aspergillosis, does not spread to other organ systems or the blood vessels. It most often affects middle-aged and elderly individuals, spreading to surrounding tissue in the lungs. The disease often does not respond to conventionally successful treatments, and requires individualized therapies in order to keep it from becoming life-threatening.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.