She'll go with a palm tap. She gives a warm smile, remembering how stressful the first few days, adjusting to Stacy, were. "From the sounds of it, your world had different advantages. Most worlds I know never had load-bearing beasts that could go through the sky. Anyway, steam technology is - have you ever boiled something and had pressure come from the steam? It's harnessing that. Locomotives and ships ran on it for a while."