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Saw this article here today, here's an excerpt:
Texts in easy-to-read typefaces make it harder to recall information than if it is presented in less legible formats, research suggests
A study by Princeton University found that a significant number of those tested could recall more information when it was presented in unusual typefaces rarely used in textbooks.
The research suggests that introducing 'disfluency' - by making information superficially harder to understand - deepens the process of learning and encourages better retention.