One of the best educational videos I’ve seen for a while. Chris deep-dives into the (surprisingly short) history of 지산법 (romanised chisanbop), a method of finger counting developed by Hang Young Pai, and its attempt to be introduced as a tool for maths education in schools in the US. It is long, but deserves every second of it’s 1 hour 23 minute runtime. One thing not mentioned in the video which I think is of interest is the origin of the name chisanbop. It is made up of the Chinese characters 指算法, which mean finger, counting, and method respectively.
