Spex, I woud be glad to respond to your question except that there is an atheist prowling these boards. This very deranged individual would abuse any information he could access.
I will give you one hint, however: "Topological event."
http://hal.archives-ouvertes.fr/docs/00/35/01/99/PDF/MSCS_abbes2007.pdf
Rocmike give it a break.