from http://xkcd.com/c149.html, because I’m a major geek, and it will make all my geek friends jealous. He’s got a lot of rather funny cartoons there. I also think these are funny: nachos, skateboards, math test, certripetal force, riemann-zeta, and this one. Or, at least they’ll get it. Most folks will have no idea why it’s funny. I’ll probably have to explain it to Loretta too.