Peter Dilworth of MIT’s Leg Lab made this bipedal walking robot based on a Troodon dinosaur.

His objective was straightforward: “It was for the robot to stand up from a sitting position, to walk and possibly run, go back to walking and stop and then sit down and be stable, and not fall over in any phase,” Dilworth explains. But as he found out, making a robot walk is a lot more challenging than it seems. “It has proven extremely difficult to make bipedal robots,” says Gregory Paul, an independent dinosaur paleontologist who collaborated with Dilworth on the project. “People assume that flight is hard to do while walking is easy; actually it’s the reverse.”

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