"Two thousand seven for me," Dustin answers back with a curt nod. "So, it's still possible that you and I could be from the same version of Earth, just yanked from different points in the timeline. We'd have to compare important historical events - things that we both agree should have happened in our world's recent past - to at least estimate a convergence."

He ponders for a moment. This is an exercise he's done a few times, although never quite so formally as he is now, and there's always a certain aspect of his version of Earth that no one else seems to agree exists. Might as well start with the big one, then.

"What do you know about the founding of the Global Trade Protectorate?"