TUCSON, Arizona, May 18 -- The University of Arizona posted the following news release: * * * Launching careers while working to protect vulnerable people from extreme heat * Kyle Peeples knows heat. Having grown up in the Phoenix area, he has endured intense summer heat waves. But the first-year University of Arizona College of Medicine - Phoenix medical student says the full impact of extreme heat was not quite clear to him until he started volunteering with Street Medicine Phoenix, which   more