Ventilation is, in my opinion, the most important thing for preventing spread of infection (not just covid), and many classroom windows are virtually unopenable or present a security risk when people forget to close them.
Also, schools tend to be overheated, in my experience.
When I was teaching often the first thing I did when entering a classroom was go and open a window. Actually, maybe the second thing if you count turning my nose up at the stuffiness/teenage pong.
How did you vote and why today
Giving Lifts - the car variety!


