Our teenaged (at the time) boys built a couple of rocket stoves a few years ago. They were small ones, made from cans gotten out of a junk pile near our house. Those things got really hot, really fast. It was quite empowering for them to make something from found materials and have it work in a useful way.
We also made a couple of those food cookers with a tuna can and rubbing alcohol. Those get SUPER hot. A can of food heats to boiling in a minute or so. Make sure you have pot holders at the ready, lol!
We also made a couple of those food cookers with a tuna can and rubbing alcohol. Those get SUPER hot. A can of food heats to boiling in a minute or so. Make sure you have pot holders at the ready, lol!