StateImpact Pennsylvania’s Scott Detrow explains what determines the retail price of gasoline. Elizabeth Fiedler reports on the controversy surrounding Pennsylvania’s new law requiring a photo ID at the polls. In advance of the Supreme Court hearing, Taunya English talks with health economist Mark Pauly about the Affordable Health Care Act. Maiken Scott discusses cuts to services for Pennsylvanians with intellectual and developmental disabilities. The Public Library Association’s annual convention is in town and Emma Jacobs reports on how libraries are changing with the times.