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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.