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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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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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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.