Mechanically-powered flashlights ? be they shake, crank or squeeze varieties ? are one of those must-have items for every emergency kit. When a tornado knocks out power, or the Big One hits, it's nice to know that you won't be fumbling around in the dark looking for batteries. But you might be surprised to learn that mechanically powered flashlights have been around for nearly a century.
Source: http://paleofuture.gizmodo.com/squeeze-and-glow-the-battery-free-flashlight-of-1923-816415047
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