A dangerous heat wave has turned deadly across parts of the United States, with New Jersey reporting at least 19 suspected heat-related deaths and broader reporting pointing to dozens of deaths as extreme temperatures stretched across several states. The heat was not simply uncomfortable summer weather. It was the kind of sustained, high-risk event that overwhelms vulnerable people, strains power systems, forces event cancellations and reminds the country that heat is now one of the most serious public safety threats in America. The hardest-hit communities show the familiar pattern of mode