Entomologists believe bed bugs have started making a comeback in places like Philadelphia in recent years. A report that aired on WHYY in Philadelphia January 17 examines the city’s battle with bedbugs and how it has evolved. Dawn Biehler, assistant professor of geography and environmental systems, was interviewed for the story and commented on the history of bedbugs in the United States and how they appeared consistently up until the 40s and 50s. “It was almost kind of an accepted condition of urban life that every once in a while, you were going to get bedbugs,” Biehler said. “Some people had …