 In 2005 , a Stanford robot won the DARPA Grand Challenge by driving autonomously for 131 miles along an <unk> desert trail . Two years later , a team from CMU won the DARPA Urban Challenge by autonomously navigating 55 miles in an Urban environment while adhering to traffic <unk> and all traffic laws . In February 2011 , in a <unk> ! quiz show exhibition match , IBM 's question answering system , Watson , defeated the two greatest <unk> ! champions , Brad <unk> and Ken Jennings , by a significant margin . 
