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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
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Carbamazepine can interfere with the results of home pregnancy tests. If you are taking carbamazepine, do not try to test for pregnancy at home.