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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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The average adult has about 21 square feet of skin.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.