While studying the wiki article for Quantum Superposition, I find this sentence: “An example of a physically observable manifestation of superposition is interference peaks from an electron wave in a double-slit experiment.” Can someone explain how interference proves (shows? demonstrates?) superposition? I search through the rest of the article and don’t recognize it if there. I guess interference shows that the amplitudes for the alternate paths are complex numbers. So… then what? Is one state that it came through slit one, and the superposed state that it came through the other? Thanks.