Its awesome that you put out a public warning as a chemistry teacher, but for those of use who are absolutely NOT interested in studying chemistry, WHY is safety important?
Because you use chemistry in your darkroom. It is not necessary to have a full knowledge of chemical processes, but safety is always important. MSDS sheets are readily available and actually make for interesting reading. Short of a chemistry class, they are perhaps the quickest way to learn the safe use and disposal of darkroom chemicals.