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Did you know?
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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.