.THE app of Bayesian inversion to a variety of lithologic specifications in an examination of seismic data rarely appears right stuff of headings. Yet when the seismic records you are actually determining arised from Mars, as well as when your thinking suggests that the most effective explanation for all of them is fluid water in the pores between rocks, you possess a tale. There is little people thirst for extra, when it relates to planetary science, than water on Mars. Why performs the prospect produce such pleasure-- and also what does this brand new research add to the account?