I question the article's use of the word digital which covers both e-ink and LCD devices. The Mangen study it mentions was e-ink vs paper, but it was only 50 p

I question the article's use of the word digital which covers both e-ink and LCD devices. The Mangen study it mentions was e-ink vs paper, but it was only 50 people and her own later work appears to call it into question. In the other studies mentioned it's not clear from the article if they were LCD or e-ink, and I suspect they were LCD. The "technology of recurrence" is interesting. I do use e-ink and I'm considerably less likely to go back a few pages to check something out than if I was reading a paper book.