The multiverse: our universe is suspiciously unlikely to exist – unless it is one of many
Not the multiverse as imagined by Marvel (or in my upcoming series of related model builds), but an array of parallels with slightly tweaked physical constants. Some of these universes are amenable to life- to a greater or lesser extent than our own- but most would be incapable of supporting it.
Just a theory to befuddle my brain on my lunch break.