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There are 20 feet of blood vessels in each square inch of human skin.
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As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.
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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.