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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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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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There are more bacteria in your mouth than there are people in the world.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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