.THE APPLICATION of Bayesian inversion to a range of lithologic guidelines in an analysis of seismic data hardly appears the stuff of headings. Yet when the seismic records you are examining arised from Mars, and when your reasoning advises that the very best description for them is fluid water in the pores between rocks, you have a tale. There is dwarfs crave a lot more, when it relates to wandering science, than water on Mars. Why carries out the prospect produce such excitement-- as well as what performs this brand-new analysis contribute to the tale?