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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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Thyroid conditions may make getting pregnant impossible.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).