The 42.195-kilometer race (the length of a real marathon) took place in Osaka, and a little humanoid robot called Robovie-PC was the big champion. It crossed the finish line after a grueling 54 hours, 57 minutes and 50.26 seconds more than two days running non-stop on the track. Only 1.73 seconds later, another contestant, Robovie-PC Lite, completed the race.The winning team used line-tracking to navigate the track, taking advantage of the rule allowing autonomous navigation. The other teams patiently controlled their bots using remotes. When batteries ran low, teams rushed in to swap them for fresh ones. Periodically, teams also needed to spray overheating motors with cans of cool, compressed air. All robots had to be designed with an automatic "getting up" feature when falls down.
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