Camden Bowen (dude is making a 3D printed internal combustion engine)
AustinMcConnell (random shit)
Two Minute Papers (ML paper review)
Plainly Difficult (industrial accidents/disasters)
Perun (military science)
EEVBlog (electronics engineering)
Summoning Salt (speedruns)
High Performance Academy (cars/tuning)
Ordinary Things (random shit)
Grind Hard Plumbing Co (cars/fabrication)
Engineering Explained (cars/explanation)
Half as Interesting (random shit)
Wendover Productions (random shit, but high quality)
Economics Explained (self explanatory)
Mini Air Craft Investigations (self explanatory)
Renegade Cut (leftist content)
LegalEagle (law)
Townsends (historical foods)
Casual Navigation (maritime/shipping)
How To Drink (mixed drinks)
Huygens Optics (optics/fabrication)
EmpLemon (weird video essays)
minutephysics (physics, and general science communications)
All of these I'd recommend for a general audience/nerdy person. Some of them are informative, some of them are funny. I've got much more that I'm personally interested in, but generally won't be interesting for the average person.