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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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There are approximately 3 million unintended pregnancies in the United States each year.
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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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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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The longest a person has survived after a heart transplant is 24 years.