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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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The human body produces and destroys 15 million blood cells every second.
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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.