Korean GO grandmaster Lee Sedol has won his first game against Google's AlphaGo AI after losing three straight games in the historic five-game match.  Google's Ai resigned roughly five hours into the game, having calculated that it had a less than 20% chance of winning.  While AlphaGo represents a huge leap forward in the potential of AI, Lee Sedol's win shows that machines are not yet infallible.  Click here for more information on the match and Google's AlphaGo.