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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.