If one electron were to switch back and forth in its direction through time.... then given enough jumps, you could wind up with a seemingly endless supply of electrons and anti-electrons. If you take into account enough zig-zags, then all perceived electrons/positrons in the whole universe, are actualy the same particle jumping forward and backward in time. So given one electron, one proton, and one neutron... jumping to and fro in time... the whole chart of the elements could be forged. All of Earth and mankind is the same particle!, just at different locations in spacetime. This would offer a possible explanation as to why there are no identifying distinctions between two different electrons, THEY ARE EXACYTLY ALIKE! If you took, in addition, an up quark, a down quark, and a lepton, then the proton and neutron could be made from scratch, combinig with the lepton... any atom could be made. Could it be that we are all the same particle? Talk about becoming one with the universe! ...just some food for thought.

...See: About Time, by Paul davies; Chapter 9, under the sub title: A Matter Of Time Reversal (pages 204-207).