[ She might have to try and grasp at a few scientific concepts as Bruce tries to explain, but he'll do his best to do so in clear and simple terms, enough that she should understand. She might not be a scientist, but she's pretty smart anyway, so he figures it won't be too difficult for her to understand it, at least partly. ]

Well, you're considering time from a linear point of view. But the way you perceive time isn't how it really is. The notion of past, present, or future only really exist on our minds. But consider that in a universe, probably any universe, everything is happening all at once. Both the beginning and the end of all things, and all the seconds, years, ages in-between. When you think of things like that, time travel isn't so much travel as it is... time displacement. Something like that. We're just taken from one place and set aside, and then put back.

[ That's simple, right? He hopes so, anyway. He avoids any complicated terms at least, and hopes that makes at least some sense. ] As for the memory loss, though, don't ask me about that. Maybe Steve was just a fluke. But if he's the rule and not the exception, then somehow they manage to wipe parts of our memory to forget about this place. Or maybe they reset us. Maybe they keep our bodies somewhere and we're just clones. Maybe we all come from our own individual alternate universes, in which things might all happen exactly the same, but while I don't remember any of this in your universe, I will in mine.

[ ... and he looks a little sheepish now. ] Sorry. I've... had some time to think about it.