.THE function of Bayesian contradiction to a series of lithologic specifications in an evaluation of seismic data barely seems right stuff of titles. However when the seismic records you are assessing originated from Mars, and also when your reasoning advises that the very best description for all of them is fluid water in the pores between rocks, you possess a story. There is actually dwarfs crave much more, when it involves planetary science, than water on Mars. Why does the possibility prompt such pleasure-- and what performs this new research add to the story?