A headline in this month's New Scientist reads, "Ether returns in bid to oust dark matter". The article goes on to describe some hypothesis about using the idea of an aether medium to modify gravity and so explain why stars in galaxies move faster than they should. My thought was; why don't we just go back to Lorentz; he developed a perfectly good theory that tied relativity phenomena directly to a universe in which the final irreducible constituent of all physical reality was the electromagnetic field. It did this in classic space-time. So I thought of a contest; in such a universe that consists only of electromagnetic phenomena, what would be an experiment that a person could conduct that would show that they were not in a universe just like our own. I blogged it here. The only thing I could come up with was the neutrino. I couldn't explain how a neutrino could exist in that context.