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There are more nerve cells in one human brain than there are stars in the Milky Way.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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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.