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The physicist David Deutsch , a strong advocate of the many-worlds interpretation of quantum mechanics , has argued along these lines , saying that " By making good choices , doing the right thing , we thicken the stack of universes in which versions of us live reasonable lives .
 David Deutsch
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 David Deutsch