Wow, this takes me back. I took intro CS at IU in 1993. At that time they were still teaching Scheme, using George Springer&#x27;s <i>Scheme and the Art of Programming</i> and something like <i>The Little Schemer</i> (but not that because I guess it didn&#x27;t come out for another two years). Delightful language with a really clean library. I always found Common Lisp&#x27;s naming conventions to be—dare I say it?—PHP-esque in their irregularity. Scheme, meanwhile, actually <i>has</i> naming conventions. :)