  A particle is described as a non-spreading wave packet satisfying a linear
equation within the framework of special relativity. Young's and other
interference experiments are explained with a hypothesis that there is a
coupling interaction between the peaked and non-peaked pieces of the wave
packet. This explanation of the interference experiments provides a realistic
interpretation of quantum mechanics. The interpretation implies that there is
physical reality of particles and no wave function collapse. It also implies
that neither classical mechanics nor current quantum mechanics is a complete
theory for describing physical reality and the Bell inequalities are not the
proper touchstones for reality and locality. The problems of the boundary
between the macro-world and micro-world and the de-coherence in the transition
region (meso-world) between the two are discussed. The present interpretation
of quantum mechanics is consistent with the physical aspects of the Copenhagen
interpretation, such as, the superposition principle, Heisenberg's uncertainty
principle and Born's probability interpretation, but does not favor its
philosophical aspects, such as, non-reality, non-objectivity, non-causality and
the complementary principle.
