
Years ago I heard an hypothesis. No idea if it is valid.
On the many many earths in parallel universes, each entity is duplicated. When someone dies (or a bug dies) its "soul" (for want of a better word) migrates to another parallel world where that entity is still alive. When an entire world goes blooey (nuclear armageddon, meteor strike, etc.), there is a mass migration of souls of all creatures.
Ever wake up from a horrifying nightmare in which you had died or the world had ended? The hypothesis predicts such nightmares while the soul from the dead version of self moves into your sleeping consciousness.
Ideally, we each learn from all the souls seeking refuge in us. We are shards of a hologram. As the shards come together, the holograms have more details. We become more of who we used to be. In the process we gain wisdom. We learn to avoid the mistakes which killed the bodies of those souls who have migrated to us.
In theory, as worlds kill themselves off, the surviving worlds are less likely to make that same error, because we are learning from the errors of the ones who failed to survive. The longer our world survives, the greater the probability that our world will continue to survive.
No idea if it is true. I would not get all complacent. I would not *believe* in the hypothesis. But it is something to think about when one wakes up in utter terror from a dream of utter destruction.
"Memory, prophecy and Fantasy — the past, the future and the dreaming moment between — are all one country, living one immortal day. To know that is wisdom. To use it is the Art."
— Clive Barker