In the past, we may have used "Do-It-Yourself Biology" to describe hobbies for people who liked nature. Perhaps that's still true, but a new group of enthusiasts has appeared on the scene. Raised on gel electrophoresis and high-school labs with GFP-cloning kits, this generation wants a more hands-on approach. They're not content with yesterday's pursuits like bird watching, ant farming, and germinating seeds in a glass dish.