44806
The series used a variety of different techniques to present the topics being discussed , including endoscopes and computer graphics for internal shots , time-lapse photography to show the growth of hair and nails , magnetic resonance imaging and scanning electron microscopy .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None