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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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The horizontal fraction bar was introduced by the Arabs.
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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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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.