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And by every indication they, do he has competed and done very well in this event. i think it's giving him in some ways an advantage. that we're not quite sure of what it is yet. until they can show it's equivalent to human legs in terms of speed and the rest of it, johnson -- i hate to say it. i don't want to be a bad guy. but the fact is you do this and this stuff gets better and better. when does it end? >> greg: that is the point. in four years or eight years you know how technology is. this will surpass the human leg. then what do you do? >> andrea: it's part of a largeer debate we are ha...

And by every indication they, do he has competed and done very well in this event. i think it's giving him in some ways an advantage. that we're not quite sure of what it is yet. until they can show it's equivalent to human legs in terms of speed and the rest of it, johnson -- i hate to say it. i don't want to be a bad guy. but the fact is you do this and this stuff gets better and better. when does it end? >> greg: that is the point. in four years or eight years you know how technology is. this will surpass the human leg. then what do you do? >> andrea: it's part of a largeer debate we are ha...