Christopher, my 13-year-old son, really impressed me by performing knee surgery on a patient today - virtual knee surgery. The surgery itself is animated and interactive, and is not gory at all. There is, however, one area on the site where you can view actual knee surgery photos. Christopher looked at those, but I skipped that part.
The name of the site is EdHeads, and it has lots of neat activities. Christopher also enjoyed the one focusing on simple machines. We'll probably try out some more of them in the next few days. Here's the link, if you'd like to check it out:

















