"what does that mean?"
"It means you are part of nature."
"Miss Frizzle and The Magic School Bus must be nature then because they can go inside of your body."
"Actually Miss Frizzle and The Magic School Bus are fiction."
"What does that mean?"
"That means they are made up."
Sofia laughs. "Something has to be real for you to make it up. Either that or it has to be words that you string together."