No windows
This Twitter user is quite concerned about the lack of windows in American schools, even likening them to prison blocks. I’m sure that you had windows in your school, but it is true that a lot of schools seem to be lacking in that department.
The average American high school building is 50 years old and they were all built with a similar design. Larger rooms were built with fewer windows so that less light got in to disrupt presentations and to keep them cool.