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Since the 1950 s , a number of scholars , first and most notably Yehoshua Bar-Hillel , have questioned the possibility of achieving fully automatic machine translation of high quality .
 Yehoshua Bar-Hillel
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:
 Yehoshua Bar-Hillel