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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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.