.THE APPLICATION of Bayesian inversion to a range of lithologic parameters in an analysis of seismic records hardly seems right stuff of headlines. Yet when the seismic records you are determining come from Mars, as well as when your reasoning suggests that the most effective illustration for all of them is liquefied water in the pores in between stones, you possess an account. There is dwarfs crave a lot more, when it comes to wandering science, than water on Mars. Why carries out the possibility provoke such excitement-- and what performs this new research contribute to the story?