Why It Was Almost Impossible to Make the Blue LED

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

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I didn't watch this, but i bet technology connections video about blue Christmas lights is more entertaining!
- Which one? The man can't stop making videos about blue Christmas lights!
  
  All of them! I like Veritasium though, not every video is a banger but this one definitely is

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