"Simple" shouldn't mean "limited vocabulary". The problem isn't the words used, it's the way the writer expresses the subject using words. It should mean grad

"Simple" shouldn't mean "limited vocabulary". The problem isn't the words used, it's the way the writer expresses the subject using words. It should mean gradually revealing a complicated subject by building one simple concept upon another. An example is explaining a rainbow; avoiding the word "refraction" would actually make the explanation more difficult, so instead start by explaining what refraction is.