.THE function of Bayesian contradiction to a series of lithologic criteria in an evaluation of seismic information hardly appears the stuff of headlines. But when the seismic records you are actually assessing stemmed from Mars, and when your reasoning 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 even more, when it involves planetal science, than water on Mars. Why does the prospect produce such enthusiasm-- as well as what does this brand-new analysis contribute to the story?