.THE function of Bayesian contradiction to a series of lithologic criteria in an analysis of seismic records rarely appears the stuff of headlines. However when the seismic data you are actually examining stemmed from Mars, as well as when your reasoning advises that the best illustration for them is actually liquefied water in the pores in between stones, you possess a tale. There is little people crave even more, when it relates to wandering scientific research, than water on Mars. Why does the possibility prompt such enthusiasm-- and also what performs this new analysis add to the story?