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Whenever a YouTube channel hits certain subscription milestones, they are awarded a YouTube Play Button. You get a silver one at 100,000 subscribers, a gold one at 1,000,000, a diamond one at 10,000,000, and a customized Play Button upon reaching the seemingly unreachable 50,000,000 subscribers. The only problem with these Play Buttons is they aren’t…

You would think that having been called a “brilliant science-and-technology documentarian” whose “videos should be held up as models of how to present complex technical information visually” would go straight to one’s head, yet Bill Hammack (AKA Engineering Guy) is anything but your typical engineering dude. The University of Illinois teacher, whose popular course, ‘The…