[ It's actually pretty surprising that she catches on? or follows at least, for the most part. he's been having to explain electricity to some of the people here so this is refreshing. And so is not being interrupted! That doesn't happen very often either.

So it helps his mood greatly when Rosalind seems genuinely interested in what he has to say, lightening his mood. ]

Oh, trust me. It was way ahead of these backwater people. Think something closer to what our alien overlords have going on.