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Can Quantum Mechanics Be Cleared from Conceptual Difficulties?

The major conceptual difficulties of quantum mechanics are analyzed. They are: the notion ”wave-particle”, the probabilistic interpretation of the Schrödinger wave ψ-function and hence the probability amplitude and its phase, long-range action, Heisenberg’s uncertainty principle, etc. The probabilistic formalism is developed in the phase space, but not in the real one. Elimination of the difficulties is likely if we are able to develop quantum mechanics in the real space. Such a theory in fact can be constructed, however, it should proceed from deepest first principles starting from the notion of a 4D space-time, the notion of a massive particle in the space, the principles of the motion of a particle, etc. The theory should be characterized by short-range action that automatically means the introduction of a quantum mechanical force. It is shown that the aforementioned force makes it evident and, moreover, is able to appear on the macroscopic scale. A simple experiment, the express test, which in fact proves the macroscopic manifestation of quantum mechanical force, is proposed for the demonstration in the quantum curriculum.