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Ratings - Science Photos

In this file photo, Dr. John Lasala, director of the Cardiac Cath Lab at Barnes-Jewish Hospital, points out one of the three major coronary arteries, the one he ominously refers to as the 'widowmaker,' using a model of the human heart, June 24, 2002 in St. Louis. The pink tubes on the model depict a heart after bypass surgery. (AP Photo/Tom Gannam)

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Ratings - Science Photos

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