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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

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

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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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