I too am a teacher and share your concerns. How would we run the lunch shifts? Class changes? Also if there were a resurgence of the virus within a school or cluster of schools, who will cover classes when the sub system gets overloaded. If we then fall back to closing schools, we will have to go through the whole start up of distance learning again. How would that affect parents who are now back at their jobs only to find that their kids will have to be home again? No easy answers for sure. For those of you who have kids at home, I realize that this distance learning is probably very difficult to manage if your child is not very independent, or is at an age where they need a lot of supervision. I can not speak for other school districts, but please know most teachers (hopefully all teachers, but I'm a realist) are working very hard to try to reach out to their students and create a learning experience that is meaningful. I am spending full days adapting materials, making videos, emailing students and parents, and attempting Zoom sessions. (Zooming with large groups of middle schoolers is tricky lol) I think it would be quite risky to open prematurely.