As heat waves sweep the country, NPR’s A Martinez asks W. Larry Kenney, professor of physiology and kinesiology at Penn State University, how extreme heat affects humans. TO MARTINEZ, HOST: A dangerous heat wave is hitting parts of the central and eastern United States and is expected to last through the Fourth of July weekend.
The heat is possible on Saturday in some central areas, but not in the east, where it will be dangerously hot for those attending outdoor events. The other concern is severe storms across the northern plains, the Midwest and up to the Great Lakes. This will dramatically end the heat: damaging hail, destructive winds, flash