The weak interaction is chiral: it affects left-handed helicity fermions much more strongly than it affects right-handed helicity fermions. Is there a hidden mirror universe, joined to our own, where everything is a mirror image? Where almost all humans have hearts in the right side of their ribcage and the sun rises in the west?
Could this explain dark matter? Is their universe the shadow of dark matter on ours just as ours reciprocally casts a dark matter shadow on theirs?