There's nothing quite like the home creation of deadly weapons. I mean, what could go wrong? This beautiful $11 wall chart explains how everyday materials can become a propane-powered flamethrower, and there's a potato cannon version, too. Take a look:
OK, so maybe this isn't one for your younger cousins. The 36- x 24-inch posters are really only intended for responsible folks (and those with a mad scientist streak).
The info comes from Bill Gurstelle, of MAKE magazine and Backyard Ballistics fame. You may have also seen his book Absinthe & Flamethrowers: Projects and Ruminations on the Art of Living Dangerously. Great read, and that title sums up these sort of experiments perfectly. [Make Store via Make Blog]