After downloading 2 LISP interpreters only to find them rather amateurish (I'm sorry, but if I, a complete LISP newbie, happen to crash the interpreter on my 2nd sexpr eval, something is wrong)...I ...

During the AI research boom of the 1970s, the LISP language – from LISt Processor – saw a major surge in use and development, including many dialects being developed. One of these dialects was Scheme, ...