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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.