I taught in a self contained behavior disorder/severely emotionally disturbed classroom for 28 years. We took take down and restraint training every few years. I had a problem about once a year that required some hands on intervention. For the most part my students were more respectful and...
There ain't no cure for stupid. I never wanted to even live in the town where I taught. 8 hours of the the students were enough and I'm sure they felt the same way about me.
I saw a test of one of the printed guns on YouTube. It blew up the first time it was fired. Imagine having one blow up in your hands--it would ruin your sex life.
I noticed it was developed in Poland, Reminds me of the story of doctors from England, Poland and France meeting to discuss their research on why men have a knob on the end of their penis. The English doctors said the knob was there for the pleasure of the man. The French doctors disagreed...