The biggest advantage of Tau over Pi probably lies in learning trigonometry for the first time. That's not something you can judge for yourself, as you can't l

The biggest advantage of Tau over Pi probably lies in learning trigonometry for the first time. That's not something you can judge for yourself, as you can't learn something for the first time twice. We should perform experiments, but I strongly suspect that using Tau (or 2Pi as if it where a single symbol) would significantly reduce confusion in the heads of the pupils. That would count as a "big advantage" in my book. Now does Tau have an actual disadvantage besides clashing with time constants and such? If not, we should keep in mind that switching is a one-time cost while the cost of using a worse notation is unbounded (proportional to the number of uses, actually). I have to reckon however that making an effort to switch away from Pi probably shouldn't be our first priority. I don't know Gaussian units nor Einstein notation, but if they do "really help" then we probably should take care of that first.