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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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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.

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Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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Cyanide works by making the human body unable to use oxygen.

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