Lock Picking Lawyer - You’ll quickly realize that locks only keep honest people honest. I even got my own set of practice picks to play around with.
Deviant Ollam - A professional penetration tester. His job is to infiltrate secure facilities then tell them how he did it, so they can improve their security. He takes LPL’s expertise, and puts it into practice. Start with his “I’ll let myself in” talk.
Veritasium - Dude talks at a camera about some niche science and tech concepts.
*Tom Scott - Now retired, so no new videos. Same idea as Veritasium, with a different host.
Technology Connections - Charmingly dorky dude in an t-shirt and blazer explains how everyday items work. Everything from air conditioners to jukeboxes and coffee makers. He’s a big part of why I’m not afraid to troubleshoot my own appliances.
Primitive Technology - Dude goes out into the middle of a forest and builds stuff with nothing but handmade tools. Turn on closed captioning!
Macho Nacho Productions - Retro console modding and emulation, featuring installs and reviews for some of the most popular mods and emulation tools.
Pirate Software - Former Blizzard/Amazon game dev is making his own indie game. There’s also a healthy dose of offensive digital security sprinkled throughout, because he’s also a greyhat hacker.
Practical Engineering - An engineer explains and demonstrates all kinds of engineering concepts, in a simple and easy to follow format. You’ll start seeing examples of his concepts all around you.
Adam Savage’s Tested - Adam Savage (of Mythbusters fame) builds and shows off all kinds of fun stuff. He also has great insight into how to best utilize a bunch of different tools and equipment.
The Modern Rogue - Two professional idiots try not to injure themselves (and often fail) while stumbling through learning everything from simple bar tricks to knife throwing and Mongolian archery. One of the hosts is a magician of some repute, so there are occasional bits of illusion and sleight of hand thrown in too. It’s basically “what would happen if a couple of dads tried to teach themselves how to make ninja stars in a garage?”
William Osman - Dude with programming and electrical engineering experience uses it to create a musical bidet, and other equally dumb things.
Michael Reeves - See above. He’s friends with William Osman, and they often collab.
Dropout - The old CollegeHumor production crew. They have a variety of content. Game Changer is my personal favorite; Contestants compete on a game show where the rules change with every episode, and the contestants aren’t told what the new rules are.