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He offered in 1974 a new explanation of Olbers ' paradox ( the " dark night sky " riddle ) , demonstrating the consequences of fractal theory as a sufficient , but not necessary , resolution of the paradox .
 person: Olbers
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Olbers 
Answer:
 person: Olbers