As for the question posted elsewhere of proving impossibility , it is an incorrect question. Like asking what is the marital status of the numeral 5 there is no correct answer since the question will not allow it.

Rather it is the nature of the universe at its foundation to have all possibilities existing simultaneously until an observer enters the picture.

To claim impossibility is to be bound by a mechanical clock work view of the universe which, if you have been reading, ain't so on the quantum scale.