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Dr. Mark R. Pitzer.mp4 duration 2 minutes 57 seconds Dr. Mark R. Pitzer.mp4 Dr. Mark R. Pitzer.mp4	Dr. Mark R. Pitzer.mp4 emotion psychology expectations humour humor difference fulfillment sense human behavior doctor music teaching martha meant pitzer sociology index associate effects student smile remember educational psychology university importantly teaching. behavioral laughter professor strengthens From Samuel Williams 66 plays 0

duration 2 minutes 57 seconds

Dr. Mark R. Pitzer.mp4

From Samuel Williams 66 plays 0