63504
An extension of this is the term " gigadeath " , describing deaths in billions , such as projected by retired artificial intelligence researcher Hugo de Garis as the consequence of a supposedly inevitable future war between proponents and opponents of artificial intelligent entities .
 Hugo de Garis
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:
 Hugo de Garis