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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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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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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.