Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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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 horizontal fraction bar was introduced by the Arabs.
