http://xwhy.comicgenesis.com/d/20090625.html
I know that I could've done the accretion disk better had I had more time to prefer (and had I thought of it sooner).
Colleagues liked it but they thought that the teachers could have been circling the clock better.
One suggested an update. I'm thinking about it, but I'm a bit tired today, and I'm not sure I like making big changes after publishing them.
