20 Years ago Linus Torvalds announced on a Web bulletin board that he'd begun working on a free computer operating system. In that message, Torvalds described Linux as just a hobby, won't be big and professional.
Now, two decades later - whether you're aware of it or not - Linux is practically everywhere.
It has become an essential part of the computing world, where it quietly powers many of the modern innovations we take for granted. You can't even fly on an airplane ... you can't use Facebook, you can't buy a book from Amazon, without running into Linux.