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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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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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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.