We've all been there — the power goes out during a storm and you reach for the flashlight, but it's completely dead and there's no batteries in sight. Wouldn't it be nice if there was a flashlight that never needed batteries? There is. The Forever Flashlight ($25) uses electromagnetic energy created by you to produce light on demand. Just shake the flashlight back and forth for 15-30 seconds, and enough electricity is generated to light its bright blue LED bulb for up to five minutes of continuous use.
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