She was enthusiastic in her questioning and even more so in his answers. When he explained things she didn't understand she was able to understand at least the concept behind it, even if that wasn't how they did it back home. When he explained things that she could grasp, she usually piped in how they had something like that on Serenity. However, the response about how fast she ran, well, Kaylee's face fell a tad, shoulders sinking and she loosened her grip on Scotty's arm. "Ain't nothin' run that fast back home," she said softly in response.