Testing hypothesisessss (or however you spell that!). Here you see what should happen in our classes–21st Century skills-troubleshooting, working collaboratively, problem/project based learning. Look at the video below. A class puts a live goldfish in liquid nitrogen, then puts it back in a beaker of water. It then thaws and starts swimming again. Think of how many directions you can take this then…and how many ways to use various technologies to assist.