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Roboticists have built passive walking robots like the one from Cornell, it walked 5.6 miles without power. https://www.youtube.com/watch?v=LDljbN7eJ5Y Japanese roboticists have built passive walking robot with locking knees: https://www.youtube.com/watch?v=rhu2xNIpgDE

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Exactly. The thing that hasn't been figured out yet is how to combine the energy efficiency and aesthetics of passive walking with the versatility needed to have the robot do useful work, especially in a principled way.

nice! i had seen an earlier prototype of the cornell walker but it’s really great to see this record-setting video!

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