It's one of the top level comments: http://www.reddit.com/r/AskReddit/comments/tmtd4/what_are_the_most_intellectually_stimulating/c4o2401 http://www.reddit.com/

It's one of the top level comments: http://www.reddit.com/r/AskReddit/comments/tmtd4/what_are_the_most_intellectually_stimulating/c4o2401 http://www.reddit.com/r/AskReddit/comments/tmtd4/what_are_th... The list at the top of the page is perfunctory, the rest of the top-level comments are meant to add to it.