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Technology@lemmy.worldEnglish · 2 years ago

Why It Was Almost Impossible to Make the Blue LED

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Why It Was Almost Impossible to Make the Blue LED

Whirling_Cloudburst@lemmy.world to

Technology@lemmy.worldEnglish · 2 years ago

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

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heckypecky@lemmy.dbzer0.com
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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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