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There are 60,000 miles of blood vessels in every adult human.
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Cyanide works by making the human body unable to use oxygen.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.