Spaced repetition seems promising. Or letting students learn at their own pace. Maybe going deeper down in details they're interested in. But we had those for decades and they never took off.

Maybe we should be looking more into learning than teaching.

I learnt a lot from Europa Universalis. I think people should be able to simply experiment more with things, see what happens when they tweak things, actually play.

We teach derivatives and integrals all the time, and yet nobody has mainstream software that illustrates how they work. The concept is easy visually, difficult in writing. It's used a lot in algorithms, but that's more because programmers make algorithms to illustrate to themselves the concept. We can do a good deal with physics, chemistry, and so on.