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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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There are more sensory neurons in the tongue than in any other part of the body.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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Excessive alcohol use costs the country approximately $235 billion every year.
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The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.