Humanoids run world’s first robot marathon race

Five bipedal machines began the non-stop 42.2-kilometre (26.2-mile) contest on a 100-metre indoor track in the western Japanese city of Osaka Thursday morning after doing knee bends or raising their hands to greet spectators.

One of the competitors retired after finishing only the first lap, but the others continued running day and night, getting up by themselves every time they fell to the floor or got into collisions with rivals.