Exactly. My 4 year old sometimes surprises me like that. Last week she asked me how you can talk into a mobile phone. So I said, there's a tiny transmitter in t

Exactly. My 4 year old sometimes surprises me like that. Last week she asked me how you can talk into a mobile phone. So I said, there's a tiny transmitter in there, and it sends the voice over waves in the air. So she's like, "OK" and I thought it went over her head. Then yesterday she asked: "Why couldn't you call gramps when we were on the plane?" I told her that the mobile phone wasn't close enough to the receivers on the ground. It amazed me that obviously some facts had been stewing for a week in that tiny head. And out comes another question.