.THE function of Bayesian inversion to a range of lithologic guidelines in an assessment of seismic records hardly seems to be the stuff of headings. However when the seismic data you are actually assessing originated from Mars, and also when your thinking proposes that the greatest illustration for all of them is fluid water in the pores between rocks, you have an account. There is little people thirst for extra, when it relates to planetary scientific research, than water on Mars. Why does the prospect produce such enjoyment-- and also what performs this new investigation add to the tale?