Path integral method

In 1947, Richard Feynman developed an alternative interpretation to quantum mechanics. This is known as the "path integral" or "sum over histories" method. In this interpretation, a particle can follow all possible paths at the same time! An implication of this interpretation was that a particle in the double-slit experiment goes through both slits at once. The particle will follow two paths at the same time. The electron in the double-slit experiment, according to the path integral method, will follow all possible paths from the source to the screen. The final observed position of the particle is the combination of all the possible paths. The most paradoxical part of this interpretation is that the particle remains point-like the entire time. There is no matter wave nor is there a wave of probability. Even more alarming is that the results of this interpretation come out identical to the results yielded from the Copenhagen interpretation (which instead, uses waves of probability).