Levels of Education

[Surgenator]

I'm partial to either axioms or sterile neutrinos.

The chances for detection are probably pretty lousy for the latter, eh?

Not necessarily. Your correct that the cross section for sterile neutrino's is very small. There is still hope. If you can measure the neutrino flux from a nuclear reactor, you can compare the total flux very near to the reactor to one farther away. A decrease in total flux would mean that some of the known neutrinos oscillated to a sterile neutrino. This is of course not a direct detection, but this would be possible with our current technology.