Time travel. His eyes (just) slightly widen before he seems a little amused. "That's the first time I've ever heard about actual time travel, but I guess I shouldn't be surprised by now." Not that he's even been here for a single week, but still.
"I can't say I ever even learned about that time period, to start with, so I have no real guess. What was it like? If you don't mind my asking."