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Maybe they can use this to fix the creepy "negative knees" of honda's asimo robot

By the way, since Asimo can do 9km/h, how is 4km/h the fastest?

It's doing 4km/h with 14 cm legs. If that scales linearly to human size legs, say 100 cm, it'll be doing 28 km/h.

For comparison, Usain Bolt can sprint at ~45 km/h for 10 seconds, and pro marathoners struggle to hit 20 km/h sustained.

But it will probably not scale linearly.