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