There may only be one logical method where we can safely open schools for children during the Corona-19 virus pandemic.
It is actually rather old-fashioned, but it is amazingly safe. A hundred years ago, public schools were nearly all the same, one-room school houses. There was one Teacher and 6 to 10 children of various Grade levels.
A modern variant of this can make wonderful sense. Several local small abandoned vacant homes, along with surrounding chain link fencing, could separate groups of children and their Teacher from external diseases, and even from bullies and gangs.
Children can each live at home and walk to spend each school day with a trusted Teacher.
Computers are involved for some subjects and for some Grades). A Teacher may not need to Teach some subjects, such as Geography or History or Art, where most of the available information would be provided by computers during "Geography Hour" and "History Hour". The Teacher might be most suited to Teaching English and Spelling and Math (essentially "reading, writing and arithmetic"). The Teacher may provide unique personalized Lessons for specific children. Students who shared similar interests, like in math or science or Nurse/Doctor could benefit socially by attending school with other students who had similar interests.
This might be very advantageous to the children. When I Taught Ninth-Grade High School Science, to 150 students in Classes of 35 children, I found it a problem that a quarter of my Ninth-Grade students only had Reading Scores of 2.0 (they could only read at Second-Grade level). None of them could understand the Ninth-Grade Science textbook! In one class, I sometimes found myself teaching toward the one girl who had a 7.0 Reading Score, as she could actually understand. Usually, I tried to Teach toward my 2.0 or 3.0 level students, who had no chance of understanding the High School General Science textbook. One of my Ninth-Grade girls only had a Reading Score of 0.7 (she could not even read at First-Grade level!)
If I only had 6 to 10 students, of any age or Reading Score level, and we could rely on many modern computer software programs much of the time, they could each call me over to get a clarification on a subject at their own level.
At 9 am, I might take temperature readings of their foreheads, where a student might be sent home if any danger of Covid-19 seemed present. Every few days, I would take Covid-19 mouth swabs to confirm or deny any virus presence. The students and the Teacher(s) could all be assured of excellent health safety, at all times. Each student would benefit from both computer learning and the personal touch of a very familiar teacher at all times.
No other approach can provide health safety and educational advancement of each student.
In any School District, there are many vacant, small homes that might be used for this purpose.
Modern corporate thinking of schools which have thousands of students could still exist, possibly for Shop Class and Music Class. Both this "one-room school house" approach and a more modern "corporate mega-school operation" could simultaneously be operated (in different locations). Individual parents could select from several possibilities for their children. The students of the one-room-school house, along with all of their relatives, will easily be Contact Traced for Corona-19! .