Language changes and the world changes, the students need current examples and language they understand. Thats why revisions and new books and new examples are

Language changes and the world changes, the students need current examples and language they understand. Thats why revisions and new books and new examples are needed, but not at the pace which publishers lash out "editions" today, just to run after short term profits. Its a last run by publishers to it milk as much as possible before their market dries up from the influence of the digital world, where editions are a wikipedia changesets.