88713
The position of Parmenides appeared validated by the observation that where there seems to be nothing there is air , and indeed even where there is not matter there is " something " , for instance light waves .
 Parmenides
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Parmenides