ElectroBOOM - teaches electronics and also demonstates how dangerous they can be by (in a safe-ish manner) overloading them with too much voltage or shocks himself.

The Thought Emporium - they have an overall goal of teaching a rat brain to control a robot, but make smaller videos to pay the bills like explaining the effects of radiation, looking at how long muscles and organs are “alive” after you “die”, and building their own CT scanner

NileRed/Blue - heavy chemistry channel. NileRed is very structured and dry but he explores things like turning plastic into candy, NileBlue is a more candid behind the scenes look and does things like seeing how much tungstun he can strap to himself and not look like he is trying to smuggle something.

Mr Green Guy - started by being a parody NileRed, but has branched to his own thing. Mostly chemistry stuff, but has done things like seeing what would actually happen if you microwave your hand.

Explosions&Fire - another chemistry channel, Australian guy making things that boom in his shed.

AlphaPhoenix - he has a PhD in material science and builds things like a 2 million fps camera to watch a light pulse travel across his garage and a scale so sensitive it can measure a plane while it’s in the air above the scale.

Micheal Reeves and William Osman - grouping these two together. Micheal makes things like a robot that removes tomatoes from his salads and a laser pointer that tracks your face to blind you. William builds things like a phone you can’t drop or his own X-ray machine. Both are more comedy focused, and both are kinda not doing science/maker stuff anymore. Micheal does more streams now (dunno what the streams are like, I haven’t watched one) and William has a kid and a farm now.

Stuff Made Here - He has an entire CnC shop in his basement and makes things like a basketball hoop that’ll catch anything thrown near it and a .50 caliber baseball bat.

There’s probably some more that I’m forgetting, I might add some more later