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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.