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The one on traffic lights is way more interesting than it sounds! Everybody should check it out. There's also a really interesting point he makes at the end that applies to something a lot of people on HN might relate with https://www.youtube.com/watch?v=GiYO1TObNz8

The toaster one is alright, it kinda bothered me when he said there was "literally NO reason" to design something the way it was (I think it had to do with the position of the coils) - obviously there is, it's probably just not a reason he'd like (cost, ease of manufacturing, etc). It makes me wonder if there was other info he skipped on because it "wasn't important" or "stupid". That's a pretty minor point though, overall his videos are very good.






He seems like a young technical Andy Rooney!



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