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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

