.THE APPLICATION of Bayesian contradiction to a series of lithologic guidelines in an examination of seismic information hardly appears right stuff of headings. However when the seismic records you are analyzing arised from Mars, and also when your thinking advises that the most effective explanation for all of them is fluid water in the pores between stones, you have an account. There is actually dwarfs crave more, when it relates to global science, than water on Mars. Why does the prospect prompt such enthusiasm-- and what does this brand new analysis add to the tale?