.THE APPLICATION of Bayesian contradiction to a series of lithologic criteria in an analysis of seismic data hardly seems right stuff of titles. Yet when the seismic data you are analyzing come from Mars, and also when your reasoning proposes that the greatest illustration for all of them is actually fluid water in the pores between stones, you possess a tale. There is dwarfs thirst for even more, when it involves planetary scientific research, than water on Mars. Why carries out the prospect provoke such enthusiasm-- and what performs this new study contribute to the tale?