That feeling of stupidity usually sets in, when there is no good explanation, using non field-specific jargon. If somebody explains to you a fact, using not yet

That feeling of stupidity usually sets in, when there is no good explanation, using non field-specific jargon. If somebody explains to you a fact, using not yet-explained concepts or words, you are hitting a recursive problem and can not continue. The best explanations do not use field jargon and that is the reason why they are so rare. If your beginners book uses field jargon without laymans explanations directly beside it, it is simply a bad beginners book. Bonus-points if you use field jargon from other fields not even related to the topic of the book.