Henry grins, delighted the way brilliant people are by others of similar accomplishment and intrinsic potential, an assessment not even particularly egotistical in this case; the most exigent reason he is shaken to the core by the thought of losing his mind is that he thinks about his genius as approximately as often as he thinks how it's really nice to have say...opposable thumbs- grateful when it occurs to him, but not occurring often. "What sort of energy do they take?"

Since, you know, environmental issues are a thing. "I don't know if the sort of thing you have to worry about here, but where I'm from we're beginning to realize we might burn out the planet if we aren't careful. In our own lifetimes, perhaps."