.THE function of Bayesian contradiction to a series of lithologic parameters in an assessment of seismic information rarely seems the stuff of headlines. Yet when the seismic records you are actually determining originated from Mars, and when your thinking advises that the most effective description for them is liquid water in the pores in between rocks, you have an account. There is actually dwarfs crave a lot more, when it involves earthly science, than water on Mars. Why does the prospect provoke such pleasure-- and also what performs this brand new analysis contribute to the account?