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Perhaps Dark Matter has finally come out into the light.

Third, sterile neutrinos can help explain the absence of antimatter in the universe. In the early universe, sterile neutrinos could have "stolen" what is called the "lepton number" from plasma. At a later time, the lack of lepton number was converted to a non-zero baryon number. The resulting asymmetry between baryons (like protons) and antibaryons (like antiprotons) could be the reason why the universe has no antimatter.

Source:
http://www.sciencedaily.com/releases/2006/03/060319183148.htm

Nice find, Dan. Thanks for posting.

The idea of sterile neutrinos is a speculation introduced into the standard model to explain various thing. No such particle has actually been observed.

An introduction to the subject and some of the uses of the concept are given in a PDF at:

http://arxiv.org/abs/hep-ph/0111326