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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
Alterable and unalterable risk factors for hypertension.
True-color image of layers of haze in Titan's atmosphere.