Katie Casey, a fictional character, helps start the All-American Girls Professional Baseball League, which gave women the opportunity to play professional baseball while America was involved in World War II.

Explores the concept of dressing "like a girl," in which girls dress in space suits, police officer uniforms, and laboratory coats to prove that girls can be anything they want to be.

Their magic tree house takes Jack and Annie back to retrieve a lost story in ancient Greece, where they witness the original Olympic games and are surprised to find what girls of the time were not allowed to do.

"All Dominguita wants to do is read. Especially the books in Spanish that Abuela gave to her just before she moved away. They were classics that Abuela and Dominguita read together, classics her abuela brought with her all the way from Cuba when she was a young girl. It helps Dominguita feel like Abuela's still there with her. One of her favorites, Don Quixote, tells of a brave knight errant who tries to do good deeds. Dominguita decides that she,...