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The familiar sounds of your heart are made by the heart's valves as they open and close.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.