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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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The longest a person has survived after a heart transplant is 24 years.

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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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