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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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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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The horizontal fraction bar was introduced by the Arabs.
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The average adult has about 21 square feet of skin.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.