Shakuntala Devi (November 4, 1929 – April 21, 2013) was an Indian writer and mental calculator, popularly known as the "human computer". A child prodigy, her talents eventually earned her a place in the 1982 edition of The Guinness Book of World Records. In 1977 in Dallas she competed with a computer to see who give the cube root of 188138517 faster, she won. At an American university she was asked to give the 23rd root of 916748676920039158098 66092758538016248310668014430862240712651642793465704086709659 3279205767480806790022783016354924852380335745316935111903596577547340075681688305 620821016129132845564805780158806771. She answered in 50 seconds. Her answer of 546372891 took a UNIVAC 1108 computer a full minute (10 seconds more) to confirm that she was right after it was fed with 13000 instructions. On June 18, 1980, she demonstrated the multiplication of two 13-digit numbers 7,686,369,774,870 x 2,465,099,745,779 picked at random by the Computer Department of Imp...