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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.