Grathio Labs learned how to make these as a kid and it is obvious he still finds them a blast. Using matches, a pin, some aluminum foil and a paper clip, he makes tiny rockets that provide a vivid example of what can happen when an expanding gas is trapped and channeled. There is a complete tutorial on his site, but there is also a short video of the rockets in action which is fun to watch. Hoefer even provides a free downloadable pattern which will allow you to create your own match rocket factory.
Of course, this activity involves fire so should only be done with adult supervision. And be sure to read the comments under the video for some suggestions on how to tweak the basic design. • See more: Grathio Labs (Images: Steve Hoefer. Via: Make)