George's Secret Key to the Universe is a 2007 children's book written by Lucy and Stephen Hawking with Christophe Galfard. Upon its release, the book received mixed reviews, and was followed by five sequels, George's Cosmic Treasure Hunt in 2009, George and the Big Bang in 2011, George and the Unbreakable Code in 2014 and George and the Blue Moon in 2016 and George and the Ship of Time in 2018. It was reported in June 2006 that Stephen and Lucy Hawking would be writing a children's book with Christophe Galfard, with the aim of "explaining theoretical physics in an accessible way to youngsters." The book, whose title was announced in June 2007, was released on October 23, 2007. More information...
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