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This definition further evolved until , in 1947 , it came to mean the science of substances : their structure , their properties , and the reactions that change them into other substances – a characterization accepted by Linus Pauling .
 Linus Pauling
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Linus Pauling