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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Everyone has one nostril that is larger than the other.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.