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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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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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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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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.