Hi I am learning quantum physics in 2nd year i want to know what makes Schrodinger cat quantum? how do we ended up in the Copenhagen interpretation? i.e. probability density function = 0.1; 0<x<10; =0 everywhere else we could say that the particle is simply moving very fast (ignoring relativity) and so its purely classical I do understand that the way we interpreted it is that the particle is everywhere between 0 to ten and the fact that we measure it cause it to collapse. but what i don't see is how we come to that conclusion. why do we conclude that Schrodinger cat is both alive and death? thx in advance.