Of COURSE they are 'impossible' - to you.
You seem to require DNA, YouTube videos and stereo, #3D holograms for 'proof'.
They are impossible, in the world as we know it.
If the author described a dream, then other things would be possible.
Do you assert that the gospel is true only in dreams, or do you accept that when an author describes an eclipse of the sun during a full moon that he or his source might have gotten his dates wrong?