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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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There are more bacteria in your mouth than there are people in the world.

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

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Inotropic therapy does not have a role in the treatment of most heart failure patients. These drugs can make patients feel and function better but usually do not lengthen the predicted length of their lives.

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

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