.THE function of Bayesian inversion to a variety of lithologic guidelines in an analysis of seismic information rarely seems to be right stuff of headlines. However when the seismic records you are examining stemmed from Mars, and when your reasoning advises that the very best explanation for them is fluid water in the pores between rocks, you have a story. There is actually little people thirst for much more, when it involves earthly science, than water on Mars. Why does the prospect provoke such exhilaration-- and also what performs this new research study add to the story?