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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

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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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Vaccines prevent between 2.5 and 4 million deaths every year.

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

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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.

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