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RE: Lumen - The Battery-Free Flashlight Powered By Your Body Heat
I want one! I wondered as I was reading it how it would work for people in colder places whose fingers aren't that warm but since you just need the top to be warmer than the bottom it really wouldn't be a problem for anyone who's alive. Plus it's got a great lifespan.
right, i guess the logic is, if your body is warm enough to still be alive you're giving off some level of body heat- haha exactly @elementm !