Hard-to-Read Fonts Promote Better Recall - Harvard Business Review
hbr.org/2012/03/hard-to-read-fonts-promote-better-recall/ar/pr
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
People recall what theyve read better when its printed in smaller, less legible type.