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Did you know?
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 Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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The longest a person has survived after a heart transplant is 24 years.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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Vaccines prevent between 2.5 and 4 million deaths every year.