I've been reading xkcd for a long time. It's a webcomic, yes. What it is, however, is not a cartoon. Monday, Wednesday and Friday, the reader is greeted with a barrage of sarcasm, subtle wit, science and tech. Sometimes it's all four in three panels. On Tuesdays, xkcd presents a section update called "What If?". The author of the site takes general questions from the readers, and answers them to the best of his ability, all the while injecting humor and a sense of hubris.
I highly recommend you check it out.
Science: It works, bitches!