@prettygood If you have watched the SICP video lecture series (you know, the ones with the tarboosh and the robe and wizard hat and the terribly primitive and cheesy synthesiser music), you might know that in some esoteric strains of Judaism they forbid anyone under the age of 40 to learn it, so the warning shouldn't just be "for adults only" but "for above 40 year old adults only". :sicp: