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There are 20 feet of blood vessels in each square inch of human skin.
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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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.