.THE app of Bayesian contradiction to a variety of lithologic parameters in an analysis of seismic data hardly appears the stuff of headings. But when the seismic information you are actually evaluating arised from Mars, as well as when your reasoning suggests that the very best explanation for them is liquefied water in the pores between rocks, you possess a tale. There is actually little people crave even more, when it comes to wandering science, than water on Mars. Why does the prospect prompt such excitement-- and what performs this new research include in the story?