This story was produced in collaboration with the Center for Public Integrity and Columbia Journalism Investigations. It was co-published in partnership with Mother Jones, The Arizona Republic, and Orlando Sentinel. Regional stories based on the heat illness data analysis produced by CJI can be found in Orlando Sentinel and The Arizona Republic. Mario Wilcox won’t set out in the summer without an emergency kit in his car trunk: a cooler with an ice pack and a blanket.