.THE APPLICATION of Bayesian contradiction to a series of lithologic specifications in an assessment of seismic records rarely seems the stuff of headlines. Yet when the seismic information you are actually analyzing arised from Mars, as well as when your reasoning advises that the most ideal explanation for them is liquefied water in the pores in between rocks, you possess a story. There is actually little people thirst for much more, when it comes to planetal scientific research, than water on Mars. Why does the prospect produce such excitement-- and what performs this brand new investigation contribute to the story?