.THE app of Bayesian inversion to a variety of lithologic criteria in an evaluation of seismic records rarely seems to be right stuff of headlines. But when the seismic records you are actually examining stemmed from Mars, and also when your reasoning advises that the greatest description for all of them is liquefied water in the pores between rocks, you have a tale. There is actually little people crave even more, when it pertains to worldly scientific research, than water on Mars. Why does the possibility prompt such enthusiasm-- and what performs this brand new research include in the tale?