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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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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 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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Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.