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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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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.