Twelve months ago the fastest humanoid robot on earth ran the 100m in 21.5 seconds. Yesterday in Beijing one ran it in 9.39, and Usain Bolt's 17-year-old world record now belongs to a machine that has no idea how to stop. The stop is the part the highlight reels cut. Tiangong Ultra crossed the line at a peak of 14.5 meters per second, kept going, slammed into a padded wall, and was carried off on a stretcher. Bolt jogged a victory lap in 2009. The robot got a medic. Now run the human timeline…