Learning things

Conversation with Sarah on the way to gymnastics.
Sarah: I've learned so much at school that I never learned at home.
Me: Like what?
S: Like how straws work.
M: Oh. Well, I guess that's good to know.
S: And how air pressure works.
M: I taught you that. Remember the experiment we did with the balloons lifting the pile of books?
S: Oh yeah.  I also learned that there's a census every ten years.
M: I taught you that at home.  You just weren't listening.
S: And that you have to be born in the United States to be President.
M: Yes, I never told you that, because I didn't want you to know.  I was hoping that stupid law would be changed before you found out about it.