Twenty-year-old Mary Shelley published Frankenstein; or, The Modern Prometheus anonymously in London through Lackington and Co., with 500 copies printed. The novel originated during the summer of 1816 at Lake Geneva, when Lord Byron challenged his guests to each write a ghost story during volcanic-ash darkened skies caused by the Tambora eruption. Shelley drew on Luigi Galvani's electrical experiments and Erasmus Darwin's speculations about animating dead matter. The story of a scientist creating life and recoiling from his creation blended Gothic horror with questions about scientific responsibility.