I don't think anyone should feel bad for not knowing something. My "general" knowledge is built on my experience. The first comment before OP answer's was kin

I don't think anyone should feel bad for not knowing something. My "general" knowledge is built on my experience. The first comment before OP answer's was kinda condescending about the article and I felt the same way when reading it but then op's comment made me realise I was in the wrong because I forgot that my "general" knowledge is not general at all. OP had to defend why he posted it. I wanted to tell OP that it was a good idea to post it, not for the article content, but for my teaching moment.