Yep. XKCD is currently amongst my top five fave comics: the others, unordered are: PhD, Dinosaur Comics, Narbonic (sadly the series has come to an end), and anything in the Maakies book series.
Thanks! That was interesting. Now I bought on Amazon two children's books that will be delivered about three weeks after their birthdays. I got lost there somewhere. BTW. They are by Tony Millionaire and I intended to order one. I now know how he got his name.