This is pretty sweet. It makes sense, but I guess I never realized that the quick compression of air (or many gases) can creat fire caused by the extremely heating of the gas. I also didn't know that fire pistons are already used and have been used for quite some time... they are often used for survival or just to start campfires without flint or a gas lighter. No more rubbing sticks or using lenses and the sun to start your fire! sweet. $45-$65.
Gray Matter: The Fire Piston from PopSci.com on Vimeo.
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