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Vaccines prevent between 2.5 and 4 million deaths every year.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.
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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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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.