claim: The Stanford prison experiment was an investigation into the causes of difficulties between guards and criminals.
evidence: Li Yuanhong -LRB- ; courtesy name Songqing 宋卿 ; Huangpi , Hubei , October 19 , 1864 -- Tianjin , June 3 , 1928 -RRB- was a Chinese general and politician during the Qing dynasty and the republican era .. Li ( surname ). Huangpi. Huangpi District. Hubei. Hubei. Tianjin. Tianjin. courtesy name. courtesy name. general. general. Qing dynasty. Qing dynasty. republican era. History of the Republic of China. He was three times president of the Republic of China .. Republic of China. Republic of China ( 1912–1949 ). president of the Republic of China. president of the Republic of China