So what need to be changed in properties of Nature to switch EM with Right Hand Rule into EM with Left Hand Rule? Can you explain this using a formula?

Where we can expect to see EM with LHR? Can we see it in our Laniakea? Or at opposite side of Shapley Attractor - Dipole Repeller? Or at perpendicular one? Do we have void between RHR and LHR? Can we cross it?

What is nature of EM? Is it because of nonlinear trajectory of motion of our galaxy from Dipole Repeller to Shapley Attractor? Or it because of non-linear motion of our galaxy within Laniakea? Or something else?