Dry-cell batteries, which we use in everything from pocket calculators to digital cameras, are highly toxic and difficult to recycle. One way to limit their proliferation is to use rechargeable batteries; another is to take advantage of ingenious devices powered by human muscle power, such as hand-pumped or hand powered wind up flashlights.
All you have to do with these gizmos is squeeze the handle continuously or crack the knob, and a tiny dynamo inside will generate the electrical current needed to create a bright beam of light. Hand-powered flashlights are most often used in disaster-preparedness kits, but they’re also handy if you have limited need for a conventional flashlight, but would like to keep something around just in case.
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