Dr. Stone Episode 20 English Subbed Episode Title:The Age of Energy.Episode Description:Senku and Ishigami Village begin work on the cell phone, planning to complete its construction by spring. In order to manufacture gold filaments for wiring, Senku creates a cotton candy machine to test with sugar. Senku brings cotton candy to Homura, who has been spying on the Kingdom of Science. After running into imperfections making filaments, Senku develops a gear train for the cotton candy machine, inspiring Chrome to construct a waterwheel with Kaseki.