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You Can Power a Calculator With Some LEDs
Monday March 11, 2019. 02:00 PM , from Wired: Tech.
LEDs generate light, which is why they're in our screens. But if you instead shine a light on an LED, you can generate current to run a small device.
https://www.wired.com/story/you-can-power-a-calculator-with-some-leds
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