Yes, this one is about what Simon learned from James Tanton again. Simon basically spent two months living on Tanton’s websites. He even gave me two colorful lectures on matrix math the way Tanton teaches it (Simon had already done a lot of matrix math two years ago via Brilliant.org, but Tanton’s was a new way to approach it). Simon loves teaching. He says it helps him learn.
Geeks out of the box 