The now obsolete Scottish inch (Scottish Gaelic: irleach), 1/12 of a Scottish foot, was about 1.0016 imperial inches (about 2.5441 cm). It was used in the popular expression Gie 'im an inch, an he'll tak an ell, in English "Give him an inch and he'll take an ell", first published as "For when I gave you an inch, you tooke an ell" by John Heywood in 1546. (The ell, equal to 37 inches (about 94 cm), was in use in England until 1685.) Modern versions of the saying include "Give him an inch and he'll take a mile" and "Give him and inch and he'll take a yard".
Around 1975, Will Crowther, a programmer and an amateur caver, wrote the first text adventure game, Adventure (originally called ADVENT because a filename could only be six characters long in the operating system he was using, and later named Colossal Cave Adventure). Having just gone through a divorce, he was looking for a way to connect with his two young children. Over the course of a few weekends, he wrote a text based cave exploration game that featured a sort of guide/narrator who talked in full sentences and who understood simple two word commands that came close to natural English. Adventure was programmed in Fortran for the PDP-10. Crowther's original version was an accurate simulation of part of the real Colossal Cave, but also included fantasy elements (such as axe-wielding dwarves and a magic bridge). Stanford University graduate student Don Woods discovered Adventure while working at the Stanford Artificial Intelligence Laboratory, and in 1977 obtained and expanded Crowther's source code (with Crowther's permission). Woods's changes were reminiscent of the writings of J.R.R. Tolkien, and included a troll, elves, and a volcano some claim is based on Mount Doom, but Woods says was not. In early 1977, Adventure spread across ARPAnet, and has survived on the Internet to this day. The game has since been ported to many other operating systems, and was included with the floppy-disk distribution of Microsoft's MS-DOS 5.0 OS. Adventure is a cornerstone of the online IF community; there currently exist dozens of different independently-programmed versions, with additional elements, such as new rooms or puzzles, and various scoring systems. The popularity of Adventure led to the wide success of interactive fiction during the late 1970s, when home computers had little, if any, graphics capability. Many elements of the original game have survived into the present, such as the command 'xyzzy', which is now included as an Easter Egg in modern games, such as Microsoft Minesweeper. Adventure was also directly responsible for the founding of Sierra Online (later Sierra Entertainment); Ken and Roberta Williams played the game and decided to design one of their own, but with graphics.