Parents of America's 56 million school children have two questions: When will schools reopen and how will they be safe? Like other school districts, Houston is prepared for a blended model, where some students are on campus and others are learning from home virtually. Hallway traffic will be regulated and it will be the teachers transitioning from class to class when the bell rings. Similar blueprints are being modeled in other large school districts, including for the 2 million students in Los Angeles. "Many of our school districts are projecting shortfalls of any place between 15% and 25%.