The human body produces and destroys 15 million blood cells every second.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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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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There are more bacteria in your mouth than there are people in the world.
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The horizontal fraction bar was introduced by the Arabs.
The actions of Frzb and the Frizzled receptor protein show how embryonic development represents a ba