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The invention of the blue LED, one of the most difficult and important inventions ever – which allowed the white LED – is some of the craziest Chad shit I have ever heard about anything. This guy is pinnacle determination holy crap.
@SwiftOnSecurity Yay ! This is one of the best YT "documentaries" I ever seen 
Well, it comes second to that "evolution of cans" -one, but maybe that's just me not understanding anything more advanced than steam engines.
https://www.youtube.com/watch?v=hUhisi2FBuw
EDIT: Also Differential gear, if you can count something done in 1930s to be a "youtube tutorial": https://www.youtube.com/watch?v=aNGA5Ejq8A4
@iju @SwiftOnSecurity AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH THE DIFFERENTIAL GEAR AAAAAAAAAAAAAAAAAAAAAAAAAH BLACK MAGIC ! ( I'll have to rewatch that ) !