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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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The average adult has about 21 square feet of skin.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Illicit drug use costs the United States approximately $181 billion every year.