https://en.wikipedia.org/wiki/Level_of_measurement https://en.wikipedia.org/wiki/Level_of_measurement I learned this relatively late in my life, but it was so

https://en.wikipedia.org/wiki/Level_of_measurement https://en.wikipedia.org/wiki/Level_of_measurement I learned this relatively late in my life, but it was so an insight. From one hand it is just obvious facts, but from the other hand they are nicely categorized and so feels like you have learned something completely new.