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Kryptonite is a material from the Superman mythos, specifically the ore form of a radioactive element from Superman's home planet of Krypton. First mentioned in ''The Adventures of Superman'' radio show in June 1943, the material has been featured in a variety of forms and colors (each with its own effect) in DC Comics publications and other media, including feature films, television series, and novelty items such as toys and trading card sets. The established premise is that Superman and other Kryptonian characters are susceptible to its radiation, which created usage of the term in popular culture as a reference to an individual's perceived weakness, irrespective of its nature. To commemorate the 70th anniversary of Superman, the University of Leicester participated in a public relations exercise and presented the Geological Society with "mock kryptonite", termed krypton difluoride. ==Origin== An unpublished 1940 story "The K-Metal from Krypton", by Superman co-creator Jerry Siegel featured a prototype of kryptonite, a mineral from the planet Krypton that drained Superman of his strength while giving humans superhuman powers.〔Jones, Gerard. ''Men Of Tomorrow: Geeks, Gangsters, and the Birth of the Comic Book'', 2004, pg. 181-183, ISBN 0-465-03656-2〕 A mineral actually named "kryptonite" was introduced in the story arc "The Meteor from Krypton" in June 1943 on ''The Adventures of Superman'' radio series. The actor who played Superman and Clark Kent wanted a break from the series so they had Superman in a kryptonite trap and a stand in groan with pain for several episodes till he came back from holiday. In 1949 kryptonite was incorporated into the comic mythos with issue #61 of ''Superman''. In August 1993 pioneering female editor Dorothy Woolfolk stated in an interview with Florida newspaper ''Today'' that she had found Superman's invulnerability dull, and that DC's flagship hero might be more interesting with an Achilles' heel such as adverse reactions to a fragment of his home planet.〔Tippens, Norman. "Dorothy Woolfolk, Superman Editor", ''Daily Press'' (Hampton, Virginia), December 6, 2000. (WebCitation archive ).: As related by Tippens, who notes, "although there is no definitive record".〕 Kryptonite gradually appeared more frequently, causing science fiction writer Larry Niven to theorize in tongue-in-cheek fashion that Krypton was in fact a Dyson sphere, and that this was the underlying reason for so much of the mineral finding its way to Earth courtesy of meteor showers.〔Niven, Larry. "Man of Steel, Woman of Kleenex", ''All the Myriad Ways'' (Ballantine Books, 1971).〕 In an effort to reduce the use of kryptonite in storylines, all known forms on Earth were transmuted into "k-iron" in a 1971 story arc〔''Superman'' #233-235 (Jan. - March), #237-238 (May - June), #240 -242 (July - Sept.)〕 titled "The Sandman Saga". 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Kryptonite」の詳細全文を読む スポンサード リンク
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