Mari spends time with Dr. Gilbert while he hypothesizes about the Earth's magnetism. Meanwhile, Waka and her brother search Mr. Hayase's lab for signs of Mari.

An afternoon following a school lesson on Ben Franklin leads to Mari meeting the man himself, helping with the kite experiment, and discussing future appliance innovations.

Mari meets up with an unexpected guest of Alessandro Volta and learns a little more about her father's whereabouts.

Waka's wish to travel back in time is granted, but things don't go quite the way she had planned.

Mari takes a break from fretting about midterm grades to witness an electromagnet demonstration inspire a revolution in communications technology.