'When the facts change, we have to be willing to change as well.' School masking guidance from Children's Hospital of Philadelphia

The school mask debate has been raging for more than a year and half. But a lot has changed since this time last year. In the second interview of KYW Newsradio In Depth's two part series on school masks, KYW's Jim Melwert talks to Dr. David Rubin, the director of CHOP Policy Lab which has been key in informing school boards and administrators on how to handle everything from in person learn, hybrid learning, physical distancing, and now, once again, masking.