[Farmer John]

If I have a love of software, a large part of it is for spreadsheets. They just get better and better, and since any cell can have a very complex maths and logic plus data handling formula in it, they are very powerful. The problem is that many that you come across are completely incomprehensible, no explanation as to how they work and imperfectly protected. They usually don't survive being passed on to another generation of users, then someone junks them and starts again. I made one that imitated Napier's bones both in it's operation and it's look, it took ages and the colour change instructions and cell formatting attributes were never completely right, but it was fun. When you get children of thirteen years old passing stuff down to another group, that has to be job done. Great stuff.