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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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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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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.