'Really, no one got the thing about 4 years? Stephan Root's time machine was pushing him and his wife 4 years into the past before she got sick and to the day where she was on the verge of perfecting the formula. The amount of time had nothing to do with Peter.' mmhmm. And the fact that it ties in with how long the show has been on the air is pretty sweet too. Peter is wrong. He is in the right 'where' just a different 'when.' My money is on a time line convergence happening with Peter and Olivia - The Key and The Lever - working as one to make it so.
You asked for a scientific explanation, fantastical as it may be. In the show, Bell postulated that the human soul is a form of indestructible energy and he set up the conditions that allowed for him to connect with Olivia. You said you wanted the show to provide a non-mystical explanation for how Bell's soul could come back. Merely pointing out the explanation has been provided because your stance is the show has done nothing to set this up.
So like Walter you draw the line at ghosts.... :D I do agree with you that your stance is pretty arbritrary but hey its your wagon to pull. Need a scientific explanation? This was all set up waaaaaaaay back in Season Two when Walter gave Olivia the tea spiked with Soul Magnets and made the link by ringing the bell. Metaphysical? Perhaps but still based on science. Far fetched science? Absolutely. But not pulled out of thin air as you fear it.
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