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Bradbury was born on August 22, 1920, in Waukegan, Illinois, to Esther (nee Moberg) Bradbury (1888-1966), a Swedish immigrant, and Leonard Spaulding Bradbury (1890-1957), a power and telephone lineman of English descent. He was given the middle name "Douglas" after the actor Douglas Fairbanks. Bradbury was related to the American Shakespeare scholar Douglas Spaulding and descended from Mary Bradbury, who was tried at one of the Salem witch trials in 1692.

Throughout his youth, Bradbury was an avid reader and writer and knew at a young age that he was "going into one of the arts." Bradbury began writing his own stories at age 11 (1931), during the Great Depression -- sometimes writing on the only available paper, butcher paper.  In his youth, he spent much time in the Carnegie library in Waukegan, reading such authors as H. G. Wells, Jules Verne, and Edgar Allan Poe. At 12, Bradbury began writing traditional horror stories and said he tried to imitate Poe until he was about 18. In addition to comics, he loved Edgar Rice Burroughs, creator of Tarzan of the Apes, especially Burroughs' John Carter of Mars series. The Warlord of Mars impressed him so much that at the age of 12, he wrote his own sequel. The young Bradbury was also a cartoonist and loved to illustrate. He wrote about Tarzan and drew his own Sunday panels. He listened to the radio show Chandu the Magician, and every night when the show went off the air, he would sit and write the entire script from memory.  As a teen in Beverly Hills, he often visited his mentor and friend science-fiction writer Bob Olsen, sharing ideas and maintaining contact. In 1936, at a secondhand bookstore in Hollywood, Bradbury discovered a handbill promoting meetings of the Los Angeles Science Fiction Society. Excited to find there were others sharing his interest, Bradbury joined a weekly Thursday-night conclave at age 16.  At age 17, Bradbury read stories published in Astounding Science Fiction, and read everything by Robert A. Heinlein, Arthur C. Clarke, and the early writings of Theodore Sturgeon and A. E. van Vogt. Bradbury cited H. G. Wells and Jules Verne as his primary science-fiction influences. Bradbury identified with Verne, saying, "He believes the human being is in a strange situation in a very strange world, and he believes that we can triumph by behaving morally".  Bradbury admitted that he stopped reading science-fiction books in his 20s and embraced a broad field of literature that included Alexander Pope and poet John Donne. Bradbury had just graduated from high school when he met Robert Heinlein, then 31 years old. Bradbury recalled, "He was well known, and he wrote humanistic science fiction, which influenced me to dare to be human instead of mechanical."
Ray Bradbury