PROGRAMMERS, when bored, sometimes like to be sarcastically vigilant in ensuring that their work covers all conceivable eventualities. Feedback thinks this might explain the actions of those who created AutoCAD, a program used to edit designs for everything from window frames to jet engine components. It even allows you to print the designs in three dimensions (12 December 2009).
Andy Howse has spotted that you can set the units in which your design is drawn up in light years. As he observes, this would be particularly useful for designing universes: “Perhaps there is…
