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The average adult has about 21 square feet of skin.

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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.

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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).

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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Excessive alcohol use costs the country approximately $235 billion every year.

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