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Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.