"What would you like to see most in minix?" 20 years ago today, Linus Torvalds told the world about a small pet project he was working on. (Full thread.) An unnamed OS based in part on Minix, it would later become Linux, the operating system behind a huge swath of modern computing. Interestingly, the creator of Minix, Andrew Tanenbaum, was not very impressed by Linux, and publicly debated Linus and others in a very long Usenet argument. (Google Groups version.)
Andrew Tanenbaum never ceases to amaze me. This delightful surprise was revealed today to visitors of one of his web sites -- which (of late) probably includes 96% of MeFi.