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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.
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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.
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The longest a person has survived after a heart transplant is 24 years.
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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.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.