Former public safety secretary Andrea Cabral joins Margery at the library.  Jason Koebler and Emanuel Maiberg are co-founders of 404 Media. They join for Press Play media analysis to talk about their reporting on Flock, an automatic license plate reader company used by police departments and federal immigration agencies. Boston Globe business columnist Shirley Leung recaps her latest columns on Mayor Wu and Boston's economy, liquor stores near Boston College and Boston's worsening traffic.  Black Hole Symphony returns for Live Music Friday. They perform at the New England Philharmonic on Dec. 14. We talk with founder David Ibbett and Shep Doeleman. Edgar B. Herwick III joins to answer a few recent questions submitted to the Curiosity Desk.  NBC Boston's Sue O’Connell discusses her coverage of the Brian Walshe trial, rats in Camberville, and that Dedham church putting up an "ICE was here" sign in their nativity scene.