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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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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).
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Illicit drug use costs the United States approximately $181 billion every year.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.