Not to sound smart ass but I got that in 1996 when I was fortunate enough to have a course on Scheme by D. Ribbens here at Liege University in Belgium. He showed us how to build that very interpreter and how powerful it was (he used to say : forget about algorithms or OOP, here's the truly powerful stuff :-) ). Since then I contemplate the slow evolution of languages, leaning to functional programming (although Scheme is not FP, that's for sure).

That said, what could be taught to a young student today that would provide the same kind of enlightenment I had with those few pages of list(p) ?