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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.
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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.