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Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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The human body produces and destroys 15 million blood cells every second.
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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 average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.