This was rather eye opening for me, especially the part in the lower left hand corner about the difference between earth-to-moon travel and moon-to-earth travel

This was rather eye opening for me, especially the part in the lower left hand corner about the difference between earth-to-moon travel and moon-to-earth travel. (The full-sized picture can be seen at [http://xkcd.com/681_large/ http://xkcd.com/681_large/].) This one also remdinds me of xkcd.com/657/, another one of his comics that probably took forever to make, but provides lots of information in a very easy to understand fasion.