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The atomistic void hypothesis was a response to the paradoxes of Parmenides and Zeno , the founders of metaphysical logic , who put forth difficult-to-answer arguments in favor of the idea that there can be no movement .
 Parmenides, Zeno
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:
 Parmenides, Zeno