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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).
More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
Vaccines prevent between 2.5 and 4 million deaths every year.
Medication errors are three times higher among children and infants than with adults.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.