cognitive psychology. PhD 
https://dl.acm.org/doi/10.1145/3462743 … "The purpose of expository (non-fiction) writing and speaking is usually to inform or instruct. To do either successfully, you must present your ideas more than once."
My PL prof in college was very proud of how his textbook was concise — every concept described without repetition or ambiguity. Took me a while before I understood the issue there. Learning isn’t rigorous! Repetition is actively good and ambiguity can sometimes help too.https://twitter.com/geoffreylitt/status/1390742850497830921 …
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