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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 average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

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Everyone has one nostril that is larger than the other.

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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

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