This infographic by Piotr Kowalczyk illustrates the 40-year history of ebooks. In the minds of many, digital reading has only been around for a few years. I’ve been reading books on PDAs since the year 2000, and there are people who’ve been reading on mobile devices for even longer; my own father has been doing this since the 80s. Thought ebooks were new? Think again–they’ve been around since 1971.