.THE app of Bayesian inversion to a stable of lithologic criteria in an evaluation of seismic records rarely seems to be right stuff of headings. But when the seismic information you are actually analyzing arised from Mars, as well as when your thinking proposes that the very best illustration for them is actually liquefied water in the pores in between rocks, you possess a story. There is dwarfs thirst for much more, when it relates to planetal science, than water on Mars. Why carries out the prospect produce such exhilaration-- and also what does this new study add to the tale?