the water and have an instrument package to look at how the water is exchanging with the modern marchandto give a better sense of the water cycle on mars. which has been very difficult to evaluate. and there's also after the definition of all the lawyers recorded in the environment, we had the time when he have water flowing down the mountain and that cut the can and will like the grand canyon and that gives us the opportunity to read the environment through the time and changes but the canyon for cutting also represents an environment that could have been habitable so we have the flowing water and the erosion and deposition of the sediments at the mouth of the tamim which is the front view of the video here and so the fleet of things we can see represents a diverse array of and fireman's over a long period of time possibly tens to hundreds of millions of years some water in the environment and so the site represents just an incredibly rich sweep of scientific investigations we can do. and it's also going to be an incredibly beautiful place and will be a lot like the southwest areas like

marchand, you are recognized. >> in the last 24 hours we have begun to hear a lot about the concept of changed cpi instead of the traditional cola method. but each of the panelists talked a little bit about that concept may be described to the public -- could each of the panelists talked a little bit about this concept, maybe describe to the public why this concept is important? >> there has been debate about the cpi come out about what the appropriate c.p.i. is almost from the time we have linked benefits to it. there is concern in the market about what basket is used relative to the goods we consume. they argue between the change to c.p.i. and the current cpi. in the current cpi, many people do not believe that when we consider the price of a good -- let's take a car -- if the price of in the city's goes up, maybe you do not -- a price of a mercedes goes up, maybe you do not buy that, but an audi. it is overstating what the true cost of living is. it extends beyond things like cars it extends on down. the argument is that c.p.i. more closely reflects the cost of what living is over t