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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.

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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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