Clever Hans could apparently do arithmetic, and a 13-member commission found no trick. Then a psychologist put blinders on him: watching his questioner he got 50 of 56 right, blinded, 2 of 35.
The math-solving horse who fooled scientists still haunts AI researchIn early 1900s Germany, a math teacher named Wilhelm von Osten toured the country with Clever Hans, a horse who could apparently add, subtract, multiply, divide, tell time, and answer questions…boingboing.net