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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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Illicit drug use costs the United States approximately $181 billion every year.

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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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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.

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If you use artificial sweeteners, such as cyclamates, your eyes may be more sensitive to light. Other factors that will make your eyes more sensitive to light include use of antibiotics, oral contraceptives, hypertension medications, diuretics, and antidiabetic medications.

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