So this is something really confusing to me. Recently a professor of mine gave a talk and said something that I thought was very interesting and kind of crazy. "The only two quantitative measurements we can make are, changes in length - in multiple dimensions - and passage of time. With these two different forms of measurement people have come up with all of Physics."
At first I was not convinced and the first thing that came to mind was mass and maybe electric/magnetic quantities, but then when I looked at how we measure them, it is indeed just a change in length on some scale and passage of time. So how did the formulations of dimensions and units come about?