Tom MacDonald reports on the new contract between the city of Philadelphia and the new security guards’ union. Temple University professor Erik Cordes talks with Dave Heller about the wind turbine builders who have agreed to limit construction during whale migrations off the Jersey coast. Emma Jacobs previews a proposed Senate immigration bill. Kevin McCorry visits a neighborhood drill team in Camden that’s keeping kids out of gangs and in school. Cartoon artist Brady Russel interviews music technology researcher Youngmoo Kim about his work.