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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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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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Your heart beats over 36 million times a year.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.