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DARPA and its insane stuff. I remind reading other day about gene therapy so soldiers could regrow limbs, go for days without food and yes, run faster than Usain Bolt. As always, warfare is the main thing driving science and technology forward, sadly.

Yeah, wheels are topologically way more efficient in plain surfaces, I'm sure, but the intimidation factor goes from the one of a silly bot on wheels to the walking monster of a sci-fi nightmare.