[A climate thing makes sense, in so far as he knows or cares about the specifics of such things. It made sense to learn about about what normally causes thunderstorms, the better not to be surprised by them again. And learning about why the length of day changes through the year, that was useful. But a lot of the details don't mean so much, when they've seen so little of the planet. in person. He doesn't pursue the topic, which accidentally gives away his confusion.]

I'm... not sure. You don't usually offer, uh, maintenance help? [Taking some care not to shift that arm, he gestures at his shoulder with the other hand.] I guess, you're in a mood for tinkering with cool devices! Which I can't blame you for, I feel the same all the time! [There's a little tone of offering the theory less out of believing it himself, more testing to see how Sans reacts to it. But he's still mostly feeling curiosity, confusion about this - not alarm. Absentminded cleaning isn't as alarming as smoothie-destroying void brain.]