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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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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.