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There are 20 feet of blood vessels in each square inch of human skin.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.