squerly
Supported Ben Carson
I hadn't seen this before, thought it was pretty cool!
http://www.youtube.com/watch?feature=player_detailpage&v=WfRovJ1KcCg
http://www.youtube.com/watch?feature=player_detailpage&v=WfRovJ1KcCg
That is an old backpacker trick. It works rather well. Nothing like a hot meal when you are tired from a day of hiking.
Probably the most modern method (still been around for centuries) is a magnification lens.