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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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The human body produces and destroys 15 million blood cells every second.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.