Emma says, "Mommy, we're doing letters at school."
"You are? What letter did you do today?
"The letter T. T is for tooth, for tent, for that other thing that looks like a tent that people live in, but it's not a tent."
I thought for a minute. "A teepee?"
"Yeah, that's it! A teepee! It's not like a tent because it's round and has a pole in the middle. Tents don't have a pole in the middle."
"Emma, who lives in teepees?"
"Aliens live in teepees."