Yes, we’ve become a little addicted and obsessed with tweets and just the idea of Twitter in the past month, but we’re not alone, as 5 million users will tell you. (Twitter recently rejected a $500 million buyout offer from Facebook, to give you an idea of the arc this is on.) As Twitter rises, it’s a good time to look back at what WIRED calls the Mother of all Demos that Douglas Engelbart made 40 years ago today to show the computer technology he’d developed for everyday office and personal use at a time when computers were only for high-level physicists.