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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

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Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.

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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

Many hobbies and leisure activities have some risk of health-related injuries Many hobbies and leisure activities have some risk of health-related injuries
Carrie Mae Weems, Untitled (Man Smoking/Malcolm X), from The Kitchen Table Series. Carrie Mae Weems, Untitled (Man Smoking/Malcolm X), from The Kitchen Table Series.
Algorithm for assessing a patient at risk for self-directed violence. Algorithm for assessing a patient at risk for self-directed violence.
Risk Factors for NSAID-Induced Gastrointestinal Ulcers Risk Factors for NSAID-Induced Gastrointestinal Ulcers
Passive touch on shoulders to end. Hold for 5 to 10 seconds. Passive touch on shoulders to end. Hold for 5 to 10 seconds.
As with smoking, drinking alcohol during pregnancy exposes the fetus to potentially toxic substances As with smoking, drinking alcohol during pregnancy exposes the fetus to potentially toxic substances
Video: Ionic bonds - role of ions in the body

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