Now Playing: 6-19-13 Marketplace Tech: A brief history of hacking

Most of us think about hackers as people who tinker with computers and make tech do things it wasn't originally supposed to do. Some people trace hacking back to the 1950s and 1960s. That's when the technologically curious started tricking telephone signal systems into unlocking free long-distance calling. But as far back as the early 1900s, farmers, ranchers -- or you could call them hackers -- started hooking up their own phone lines.