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Omitted here is Lee Smolin 's model of cosmological natural selection , also known as " fecund universes " , which proposes that universes have " offspring " that are more plentiful if they resemble our universe .
 Lee Smolin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Lee Smolin