I've always been fascinated by evolution and microrganisms. In junior high (years ago!) I discovered these games. Both are very similar, but each interesting and different in their own way. Basically you have a pool full of these little swimmer organisms and they swim, eat, mate, and die... as they continue on they evolve based on who's the fast swimmer, who mates, etc. its evolution and natural selection. The guy who made these is a genious too, and he worked on There and The Sims. http://ventrella.com/ The guy's website. truly fascinating! http://www.swimbots.com/ Gene Pool - Wiggly Evolution http://ventrella.com/Darwin/darwin.html Darwin's Pond (this isn't meant as spam or advertising, I just think quite a few people will love these games!) The downloads are free, and the games are definately educational for everyone.