Journey to the Microcosmos for microscope science: youtube.com/
Institute of Human Anatomy for physiology, with a lean towards medicine: youtube.com/
Lastly, the Godfather himself, Mark Rober for mechanical/electrical engineering, and how to use ultra-fine glitter and fart spray to fight package thieves: youtube.com/
You changed the world, Mark.
Once you start digging through enough of these, the algorithm will pick up that you like good science stuff, and will start helping you out a little. There’s thousands of them now, professionals, working fully within their areas of demonstrated expertise. I recommend googling their full names and checking their background before trusting them yourself. This is like, off the top of my head, though, just some of my favorites for evening background audio.
There’s also whole worlds of math youtubers in-line with all the above, that are outside the scope of this question.
I’ll edit if I think of more. I probably will.
edit: I do realize several of these, such as the astrophysicists, are not experimental. I’m digging for more experiment-oriented types, but neither my memory nor my algorithm is helping.