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submitted 2 years ago by Whirling_Cloudburst@lemmy.world to c/technology@lemmy.world

The blue LED was supposed to be impossible—until a young engineer proposed a moonshot idea.

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[–] heckypecky@lemmy.dbzer0.com 9 points 2 years ago

Handheld battery powered X-ray devices exist and are widely available. I used to work with those. In Germany you need a permit to operate them. https://www.thermofisher.com/order/catalog/product/de/en/XL2

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