Scheme (via DrScheme) caters to mere mortals more than any other programming language ever has. In every powerful language, it's easy for a typo to create a va

Scheme (via DrScheme) caters to mere mortals more than any other programming language ever has. In every powerful language, it's easy for a typo to create a valid program, but one that doesn't do what you intended. Usually you get an obscure error message related to the advanced feature you accidentally invoked. DrScheme takes you through a series of learning languages, each increasingly powerful. Mistakes in the early languages create helpful error messages. You don't get a better on-ramp than that.