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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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There are more bacteria in your mouth than there are people in the world.
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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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.