.THE app of Bayesian contradiction to a variety of lithologic guidelines in an assessment of seismic information barely seems to be the stuff of headings. Yet when the seismic data you are examining come from Mars, and also when your thinking proposes that the greatest explanation for all of them is liquid water in the pores between stones, you have a tale. There is little people thirst for even more, when it involves wandering science, than water on Mars. Why carries out the possibility prompt such enthusiasm-- and what does this new analysis contribute to the tale?