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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
Thyroid conditions may make getting pregnant impossible.
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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