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The average adult has about 21 square feet of skin.
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).
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.
More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.