.THE app of Bayesian inversion to a series of lithologic parameters in an examination of seismic records rarely seems the stuff of headlines. But when the seismic data you are assessing stemmed from Mars, and also when your thinking advises that the greatest explanation for all of them is actually liquid water in the pores between rocks, you have a story. There is dwarfs thirst for more, when it involves nomadic scientific research, than water on Mars. Why does the prospect provoke such exhilaration-- and also what does this new research study contribute to the story?