NPR's Scott Simon speaks with scientists Feifei Qian and Ryan Ewing of the LASSIE Project. It is training a robot dog to navigate different types of terrain in preparation for future space missions.
SIMON: Oh my. The legs seem to be the key in Spirit. Let me ask you, Mr. Ewing, why are - maybe I should call them leglike devices - so essential? EWING: There are a lot of complicated terrains ...