Each November for the last decade, Tsukuba City in Japan has run a 2,000-meter race unlike just about any other in the world. What��s unusual is not the terrain �C spanning parks, city streets, even indoor shopping malls �C or the speed, the pace is a leisurely stroll. It��s the participants: each is an autonomous robot. The event, called the Tsukuba Challenge, gives robots the difficult task of��
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