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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.