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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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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.