In the summer of 1995, the city of Chicago was besieged by a horrific heat wave that saw temperatures of 106 degrees and a heat index of 126 degrees - and by the time it was done, 700 people were believed to have perished due to the heat. NYU Sociology Professor Eric Klinenberg (who was born and raised in Chicago) wanted to know why so many people died- and why particular neighborhoods and particular sectors of the population suffered exceptionally high death rates. His 2002 book is titled "Heat Wave: A Social Autopsy of Disaster in Chicago."