Did someone here mention this before?

davidwarrenonline.com - ESSAYS ON OUR TIMES

I had suspected before that people do not retain what they read on computer screens as well as what they read in print. After my five-week experiment, I am quite sure of this. Partly for the wealth of physical associations in print reading, and partly from other causes, our memories favour the tangible. We confirm this point instinctively, every time we print out a long article.

This is a serious matter, for as any competent pedagogue could assure us, what is not retained was never adequately processed in the first place. So while the Internet provides a festival of information, it also subverts the comprehension of all things humane.