Pbskids and nickjr have shows with good content. I've learned a lot of recent science about dinosaurs by watching Dinosaur Train. There are also a lot of great videos on you tube about wildlife and about making things. We've probably watched the lego great ball contraption video (e.g [1]) 100 times and now my 6 yr old is making conveyer belts and machines for moving marbles.

You just have to look for it.

[1] https://www.youtube.com/watch?v=jxMMtIxDrGk