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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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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.
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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.