problem. bill gates today, shorthand for rebooting something. it has popped up in books and t-shirts. where did it come from? that's where we get to bill gates. during the talk at harvard, bill gates explained. >> we could have had a single button that the guy who did the ibm key board designed didn't want to give as you single button. so it was a mistake. >> any way, this thing, control alt delete which has infiltrated our lives was never supposed to be. it reminds us that a number of thing that were mistakes have become part of our everyday lives. and some of them are wonderful. bubble gum, slinky, silly putty, microwave ovens, post-it notes and penicillin were all developed by accident. and why we would not put control alt delete isn't like those, how