Preferred direction

This explains everything (i.e., nothing)! From the New Scientist (via FB):

WE COULD be living inside a black hole. This head-spinning idea is one cosmologist's conclusion based on a modification of Einstein's equations of general relativity that changes our picture of what happens at the core of a black hole.

In an analysis of the motion of particles entering a black hole, published in March, Nikodem Poplawski of Indiana University in Bloomington showed that inside each black hole there could exist another universe (Physics Letters B, DOI: 10.1016/j.physletb.2010.03.029). "Maybe the huge black holes at the centre of the Milky Way and other galaxies are bridges to different universes," Poplawski says. If that is correct - and it's a big "if" - there is nothing to rule out our universe itself being inside a black hole.

[...]

How would we know if we are living inside a black hole? Well, a spinning black hole would have imparted some spin to the space-time inside it, and this should show up as a "preferred direction" in our universe, says Poplawski. Such a preferred direction would result in the violation of a property of space-time called Lorentz symmetry, which links space and time. It has been suggested that such a violation could be responsible for the observed oscillations of neutrinos from one type to another[...]

I still don't really know what neutrinos are (but have a false idea that I understand them...intuitively...)