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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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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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The familiar sounds of your heart are made by the heart's valves as they open and close.