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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Blood is approximately twice as thick as water because of the cells and other components found in it.
The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
Medication errors are more common among seriously ill patients than with those with minor conditions.
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