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In this video:
This phenomenon began in the late 19th century with a German mathematics teacher by the name of Wilhelm Von Osten. He was a student of phrenology, which meant that he adhered to the belief that a person’s intelligence, among other things, can be determined by the size and shape of their head. In addition, he was interested in animal intelligence and the idea that it was greatly underestimated by the human race.
Want the text version?: http://www.todayifoundout.com/index.php/2013/12/horse-math-unintentional-clever-hans-hoax/
Sources:
http://www.damninteresting.com/clever-hans-the-math-horse/
http://matthew-d-smith.com/2012/01/13/the-clever-hans-effect/
http://www.ncbi.nlm.nih.gov/pubmed/23272000
http://www.skepdic.com/cleverhans.html
http://news.discovery.com/history/smartest-horse-hans-120107.htm
http://news.discovery.com/history/smartest-horse-hans-120107.htm
http://en.wikipedia.org/wiki/Clever_Hans
