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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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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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The human body produces and destroys 15 million blood cells every second.
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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.