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

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Approximately 500,000 babies are born each year in the United States to teenage mothers.

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Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.

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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

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