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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

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