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Making a wheelchair that can deal with steps and other obstacles has puzzled engineers for decades, with everything from tank treads to spokes tried and found not quite practical.
Now a team of engineers from the Chiba Institute of Technology, led by associate professor Shuro Nakajima, have applied a bit of lateral thinking. They have developed a robotic wheelchair that isn't sure what it is. Normally, it operates on wheels like a conventional wheelchair, but when it meets an obstacle, the wheels turn into legs.
