Spaced penguin: Possibly one of the coolest online games ever. It has penguins! And space! And planets! And vectors! And gravity on the bob! (or, actually on the Kevin, but still.....) Boy. If only Randy Kolach had this when I was taking physics in high school -- it would have made a big difference.

Randy was still probably the best science teacher I ever had -- he made all that gravity stuff fun and intersting, but by that point I'd ignored math long enough that I really couldn't pursue optimal physics, and therefore spent much of my time in his class editing articles for the school newspaper. And arguing about why we had to take science int he first place. In honor (?) of this, he actually wrote a question about me on the final exam: "A certain student who has a tendency to make snide comments about science is dangling on a pendulum over a pit full of alligators..." was how it started, and it was about calculating the swing of the pendulum. Sadly, I got it wrong.