During hot fall school days, every classroom I’ve been in has had numerous flies zooming in circles and causing no end of annoyance. These useless gnats not only hover around you but fly onto your head and next to your ears, making an infuriating buzzing sound that makes you go crazy. 

Adding to the frustration, they are also miniscule and almost impossible to kill. I’ve furiously slapped until my hands are sore and clapped more than 100 times and not killed a single one.

There is one possible solution: Put an electric fly zapper in every room. They work flawlessly.