.THE app of Bayesian contradiction to a variety of lithologic guidelines in an analysis of seismic records rarely seems right stuff of headlines. But when the seismic data you are examining come from Mars, and when your thinking recommends that the most ideal description for them is fluid water in the pores in between stones, you have an account. There is dwarfs crave even more, when it relates to wandering science, than water on Mars. Why does the prospect prompt such pleasure-- as well as what does this brand-new investigation include in the account?