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There are more bacteria in your mouth than there are people in the world.
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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 longest a person has survived after a heart transplant is 24 years.
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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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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.