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Did you know?
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 Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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Vaccines prevent between 2.5 and 4 million deaths every year.