106534
Since there are characteristic facial expressions ( the clenched nostrils , the pursed lips ) - as Charles Darwin , Paul Ekman , and others have shown - they may be represented with more or less skill in any set of circumstances imaginable .
 Charles Darwin, Paul Ekman
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:
 Charles Darwin, Paul Ekman