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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As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
Horse evolution.
Climate has cooled substantially during primate evolution.
