Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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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.
Photographs illustrating the shape of two different intrauterine devices
