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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
The human body produces and destroys 15 million blood cells every second.
Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.