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Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.