I think that just treating the universe as a closed system is perfectly simple and compatible with everything we know, so I'm going to go with that. We were married by a religious officiant, namely a friend of ours who got one of those online religious order, you know, $25 a year now, a holy man kind of thing. But my usual philosophy about these things is to admit that lots of things are possible in cosmology, et cetera, but to try to keep things as simple and as close to what we already know is true. Do not faster in Ramadan, do not watch fireworks in the 4th of July.