Ask unlimited questions for free
The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
There are 20 feet of blood vessels in each square inch of human skin.
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
For a complete list of videos, visit our video library