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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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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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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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The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.