Do you remember Julius Sumner Miller’s Physics lectures? I remember those running late night on the local PBS station.
Here’s one example
https://www.youtube.com/watch?v=YN2oALaRfL4
He reminds me of a summer school teacher I had in sixth grade. He was a real scientist, probably with a PhD, employed by a well-known local research lab. He wanted to teach science to kids, so we wound up with him. At the time I thought he was wasting his time on us -- we were just kids, we didn't need his level of understanding. Any old science teacher would have done. The thing is, I still remember much of the stuff he taught us. His "experiments" were fascinating, and his enthusiasm was infectious.