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The familiar sounds of your heart are made by the heart's valves as they open and close.
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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
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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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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.
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There are 60,000 miles of blood vessels in every adult human.