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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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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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Everyone has one nostril that is larger than the other.
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Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.