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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
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The average adult has about 21 square feet of skin.
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The average office desk has 400 times more bacteria on it than a toilet.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.