Striking San Francisco public school teachers left schools closed and classrooms empty Monday as they demand a deal for higher pay, fully funded healthcare and more staffing. San Francisco Mayor Daniel Lurie said he was “disappointed” and “frustrated” that United Educators of San Francisco — which oversees 6,000 unionized public school employees — could not reach an agreement with the San Francisco Unified School District (SFUSD) over the weekend, ABC7 News Bay Area reported. Lurie made a plea in a Sunday social media post to delay the strike for three days so about 50,000 students could stay in classrooms while...