President Joe Biden visited a Philadelphia elementary school Friday afternoon - and even delivered some dating advice to a classroom of third-graders. 'I want you girls to remember, no serious guys 'til you're 30,' Biden joked to a classroom of masked pupils. The School District of Philadelphia lifted its mask mandate on Wednesday, making the wearing of masks optional, but the children surrounding the president Friday all had their faces covered. Biden paid a visit Friday to the Luis Muñoz-Marín Elementary School to highlight how money was used from the American Rescue Plan on the law's one-year anniversary. In total,...