Studies show exertion-related cardiac deaths surge during storms
                                
                                
                                    (Newser) -
                                    Take it easy, snow shoveler—your activity causes heart attacks. Well, not exactly,  Slate  reports, but 2 studies show a strong correlation between heavy snowfall and an increase in heart attack deaths. In one, deaths went up 22% in the week of Northeastern blizzards and remained up in the next...