[He notices her finger; perhaps lost in an accident, or a birth defect. There's always the explanation that it was done by someone on purpose, too, but it's hard to tell the reason for the finger's shortness while she's twirling a thimble on it.

It makes him think of his own coin, though. He wishes he still had it, but Hank took it.]

A self-sufficient island in the skies. It's hard to picture... but I can see how it could work. [If Detroit has found a way to farm on rooftops, why couldn't a floating city do the same? They would have to account for atmospheric changes, but otherwise...]

As for quantum physics, I know enough, I believe. It would be easier if I could still download knowledge, but I'm sure I can keep up.