Dave Davies has a recap of today’s Pennsylvania primary. Holly Otterbein reports on Philadelphia Mayor Michael Nutter’s continuing efforts to find additional funding for the public schools. Susan Phillips visits Loyalsock State Forest, where environmentalists and the government are challenged to preserve pristine open spaces, as gas drillers exploit their mineral rights. Zack Seward looks at the growing trend of standing desks. On That’s History, Chris Satullo and Jonathan Zimmerman explore the history of school proms.