By far the greatest challenge for robots with legs is staying upright when the going gets rough. A team at the University of Pennsylvania’s Kod*lab has a hunch that we don’t need extra smarts to make that happen — just an extra appendage. The upgraded X-RHex Lite (XRL) carries a tail that will swing in the right direction to keep the robot upright if it’s caught out by a fall, much like a cat. That’s impressive for a nearly 18-pound robot (the previous Tailbot was 0.4 pounds), but we’re pretty sure no feline has six springy legs; the XRL can crash to the ground and still get back up like it ain’t no thing, which gives it a fudge factor others don’t have. We don’t know if the hexapod critter will lead to more than further experiments.

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X-RHex Lite robot grows a tail, always lands on its feet (video)

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