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Thyroid conditions may make getting pregnant impossible.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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