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There are 20 feet of blood vessels in each square inch of human skin.
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Medication errors are more common among seriously ill patients than with those with minor conditions.