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Did you know?
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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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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The human body produces and destroys 15 million blood cells every second.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.