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.
If we're going to let anyone know, 
it should be Mari's mother first.
Si se lo diremos a alguien,
será a la madre de Mari primero.
Se vamos contar a alguém,
deve ser a mãe da Mari.