The advent of self-driving cars revived the decades-old philosophical conundrum known as the "trolley problem." The basic setup is this: A vehicle is hurtling toward a group of five pedestrians, and the only way to save them is to swerve and run over a single pedestrian instead. For philosophers and psychologists, it's pure thought experiment -- a tool to tease out and scrutinize our moral intuitions. Most people will never face such a stark choice, and even if they did, studies suggest their reaction in the moment would have little to do with their views on utilitarianism or moral agency. Self-driving cars have given the problem a foothold in the real world.

Back in May, AlphaGo from Google, an AI algorithm that is part of DeepMind, defeated the human world champion Ke Jie in a three-part match. After it was over, Jie vowed never to play a computer again. But apparently something has changed his mind because Chinese news sources report that Jie will once again play an artificial intelligence at an AI tournament to be held in China in April 2018. Ke Jie is one of the tournament's ambassadors, and he will play against the AI Tianrang. Normally, a human representative places pieces on behalf of the AI, but in this case, a robotic arm developed by Fuzhou University will fulfill that role.