Friday, March 09, 2007

Just cool.

This is just cool. Basically, they're fire-starters, used by ancient tribes. Rather than the old "rubbing a string against a twig and praying" method, though, this devices work on rapidly increasing pressure inside a sealed tube. The increase in pressure and fixed volume correlate with a rapid increase in temperature -- i.e., a spark. There's even video of them working (one of them underwater, no less).

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