 Two of the most noted natural philosophers among Shelley's contemporaries were Giovanni Aldini, who made many public attempts at human reanimation through bio-electric Galvanism in London and Johann Konrad Dippel, who was supposed to have developed chemical means to extend the life span of humans.While Shelley was aware of both these men and their activities, she makes no mention of or reference to them or their experiments in any of her published or released notes.