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.
Scientists have known that for over 
fifty years, since Copernicus's day.
Los científicos lo sabemos hace 50 años,
desde la época de Copérnico.
Os cientistas sabem disso
há mais de 50 anos, desde Copérnico.