Comment Re:String theory is not science (Score 2, Informative) 147
Uh, yeah, we can measure -1. The charge of an electron. The distance along the x-axis that I travel when I walk one meter west. The effect on a wave when it encounters an identical one 180 degrees out of phase.
Not at all. None of those things "are" -1. They are observable phenomena that we tag with the human invention, the word/concept, "-1". Mathematics is not an aspect of objective observable reality, it is a language that we have found useful for describing our observations.