This is a great article. I've thought for a while that the way we teach maths is broken - not because we use too much rote or muscle memory, but because we separate teaching from practicing. We spend an hour learning a concept, and only practice using it when we get home. We spend six weeks teaching the basics of differentiation, and then move on to integration. While we do integration, we totally forget how to differentiate.

The article mentioned that memory retention is an exponential curve. Science has also shown that the best time to practice a concept is right before we would forget it. Put together, these two principles allow us to devise revision plans that make learning efficient.

Why are we stuck in the 18th century? We know so much more about how memory works, but we still keep doing the things we've always done.