Sokka pauses before answering, and not for lack of anything to say. He just has to pause and swallow back the retort that Kaylee lives on a space ship.

"...Crazy, huh?" he settles for a moment later, turning back around to give her a tight smile. "I know it sounds totally insane - my nephew made it, to get people back home once they showed up here. We've been using it for three years."