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Your heart beats over 36 million times a year.
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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.
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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Illicit drug use costs the United States approximately $181 billion every year.