David Bohm
In 1952, David Bohm, will publish two papers on quantum mechanics. Bohm proposed an alternate explanation and extension of the wavefunction that involved the particles having an actual configuration, even when not observed. This is opposed to, in the Copenhagen interpretation, where, nothing really exists until it is observed. The idea was that particles must exist whether or not they are being observed. Bohm reinterpreted the wave function by doing away with the notion of wave-particle duality. The particles remained particles. For example, in the double-slit experiment the electron would only pass through one of the slits. It's path would be guided by something called a quantum potential. The quantum potential was a kind of energy field which would emerge from the wavefunction. The quantum potential will influence the way the particles move and will result in the observed interference pattern. The quantum mechanics of Bohm is rejected by many and is considered by some to only be another kind of weirdness and not a better substitute or alternative to the Copenhagen interpretation of quantum mechanics.