.THE app of Bayesian inversion to a series of lithologic parameters in an analysis of seismic information rarely appears the stuff of titles. Yet when the seismic records you are evaluating arised from Mars, and when your thinking recommends that the best illustration for them is actually liquefied water in the pores between stones, you possess a tale. There is actually dwarfs crave more, when it comes to planetary science, than water on Mars. Why performs the prospect produce such exhilaration-- and also what does this new study include in the account?