curious

On the way home from gymnastics today, we were talking about the 3 black baby lambs we had seen at the farm the other weekend. They were hopping around. Then I asked why they were hopping. Sophie said it was because they were curious.
I said, "Are you curious?"
Vivian said, "No."
I said, "I think you are. What does curious mean?"
Sophie paused, then thoughtfully said, "Curious means you just can't stop thinking of the things you want to learn."