The invaluable Dave Barry (whom I missed severely when he took his Christmas break) points the world to a site where you can learn about virtual knee surgery.

By slicing the "knee" bit off that address I found my way here. I don't get how livingchildren.com gets to be so particularly fascinated by knee surgery, but there you go. Americans, eh? What's the betting money was involved?

I haven't run the knee surgery thing. The photos were enough for me.