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In 1939 , Semyon Davidovich Kirlian discovered that by placing an object or body part directly on photographic paper , and then passing a high voltage across the object , he would obtain the image of a glowing contour surrounding the object .
 Semyon Davidovich Kirlian
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:
 Semyon Davidovich Kirlian