A father and son head for their fishing hole at Muddy Run Recreation Park in southern Lancaster County, Pa. New research suggests that dads are less likely to die of heart-related problems than childless men are. The study by AARP, the government and several universities is the largest ever look at men, fertility and mortality. (AP Photo/Intelligencer Journal, Marty Heisey)

Question: Have your children been good for your heart?

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