We are a possibility in this universe because we exist.
And we are made of stuff from this universe.
There's a possibility to recreate everything again as long as the same stuff is available.
Maybe someday a superhuman artificial intelligence would be able to scan the entire space and time (perhaps through quantum entanglement) in an atomic level and then would be able to materialize anything in the present moment. Including human brains at any time in the past.
I like this idea because is a logical possibility.