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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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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.
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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There are 20 feet of blood vessels in each square inch of human skin.
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Illicit drug use costs the United States approximately $181 billion every year.