An autonomous tank is demonstrated in France last month. Leading researchers in artificial intelligence are calling for laws against lethal autonomous weapons. They also pledge not to work on such weapons. Christophe Morin/IP3/Getty Images hide caption
According to the researchers, there are 10 to the power of 170 possible board configurations in Go — more than the number of atoms in the known universe. DeepMind hide caption
South Korean professional Go player Lee Sedol reviews the match with other professional Go players after the fourth match against Google's artificial intelligence program, AlphaGo. Handout/Getty Images hide caption