.THE APPLICATION of Bayesian inversion to a series of lithologic criteria in an examination of seismic information rarely seems the stuff of headlines. Yet when the seismic data you are actually evaluating arised from Mars, as well as when your reasoning suggests that the very best description for all of them is actually liquid water in the pores between rocks, you possess an account. There is little people thirst for even more, when it involves planetal scientific research, than water on Mars. Why carries out the possibility prompt such excitement-- and also what does this brand new research include in the story?