If you’ve ever used a pair of glasses or a lens to start a or create a hot spot, you understand the principle. It’s pretty simple, and the video above shows you how to build your from just about any piece of ice. You’ll need to work the ice a bit into something manageable and polished so you can get the light through it, but once you do, it’s not too hard to set some kindling aflame.

Of course, if you’re headed out camping, you can pack the gear you need to start a fire ahead of time, but if you’re ever caught without it, this method could help.

Continue reading here:
Build a Fire with a Slab of Ice [Video]