.THE app of Bayesian contradiction to a variety of lithologic criteria in an examination of seismic data rarely seems the stuff of headlines. But when the seismic data you are actually analyzing arised from Mars, and also when your thinking suggests that the most ideal explanation for them is actually fluid water in the pores between rocks, you have a tale. There is little people thirst for much more, when it concerns global science, than water on Mars. Why does the prospect prompt such exhilaration-- and also what does this brand new study add to the tale?