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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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 heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).