  The major conceptual difficulties of quantum mechanics are analyzed. They
are: the notion "wave-particle", the probabilistic interpretation of the
Schroedinger wave \psi-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.
