Did this make anyone else flinch?

edit: I do want to comment on the Feynman Technique linked in the article. I've never actually written concepts down as explained, but it's very close to how I _actually_ learn (or at least, feel confident in my knowledge). If I can't explain something in plain language, there's a good chance I've gaps. The steps listed are pretty succinct - going to have to give it a try!