Tom MacDonald reports on the Philadelphia District Attorney’s new unit to review major cases. Peter Crimmins visits an exhibit at the Institute of Contemporary Art that combines sonic and visual metal shredding. Dave Heller talks with Howard Stoeckel, former Wawa CEO, about the convenience store chain’s 50th anniversary. John Abbott reviews the history of the battle against polio, that had a turning point in Pennsylvania 60 years ago. On That’s History, Shai Ben-Yaacov and Jonathan Zimmerman discuss applications of the death penalty for political purposes through history.