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The Importance of Background Knowledge in Teaching
Daniel Willingham is a cognitive psychologist at the University of Virginia. He has written and spoken about this. But if you have to stop and look things up every few words or every few sentences, that imposes a tremendous cognitive load on you. Even if only 2% of the words and phrases in a passage are unfamiliar, some studies have shown comprehension begins to suffer. If you don't have the knowledge to evaluate it, you'll be in trouble.