Compares the appearance and use of common machines such as camera, clock, telephone, bicycle, auto, train, and plane with that of the models used long ago.
Armando's family members are too busy to answer his questions until one day they take him to the library, introduce him to the librarian, and find books with the answers to his questions.
The sister of the Three Little Pigs comes to visit and tries to persuade her brothers, who have been hermits since an episode with a wolf, to overcome their fears and go outside.