[He usually doesn't notice those small kind of cues - or if he does, he frequently ignores them. It could be either this time, since he keeps beaming.]

Oh! Oh, you're a scientist, that's amazing. There must be so much we can learn from each other, since we've lived so very separately.

[Aaaaand right, the whole scary machines thing. He bites his lip a bit.]

Ah, of course you didn't mean it. What- I mean, what exactly was the purpose of them, if you don't mind? You talked about evolution...