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Asthma cases in Americans are about 75% higher today than they were in 1980.
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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 first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.