Smarter Every Day is the big one for me.

For explosives there Ordnance Lab, they have the paperwork for all kinds of stuff the Mythbusters couldn’t get their hands on.

Modern History TV for medieval life. Tod’s Workshop for pre modern weapons. Grand Thumb for firearms. Townsends for colonial/revolutionary american food and lifestyle. Primative Technology. Miniminuteman, archaeology.

Chemistry YouTube: Explosions and Fire, for an Australian synthesizing explosives in a shed. Nilered for interesting chemistry in an actual lab. Various others.

How to Cook That debunking cooking myths and tiktocs.

Donut Media, car stuff.

Visual effects and debunking: Captain Disillusion Corridor Crew

Law: Legal Eagle Steve Lehto

Special mentions: Lindybeige Sabine Hossenfelder

Start looking into this and you get loads more in your recommended. For all the low effort R-ddit and meme channels there are loads of people working on high quality content. Learning YouTube is vast once you get into it. Nebula is pretty good too.