[ they seem to be listening, tilting their head curiously even if they don't make any signs to show that they're really grasping all of it or even fully interested. but they're letting him talk since it seems to be important to him, and when he finishes there's a light hum under their breath. ]

I've never been very good at or interested in science, but I'll take your word for it. Though when you put it that way I bet some people would find that to be terrifying instead.