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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
The human body produces and destroys 15 million blood cells every second.
More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.