.THE function of Bayesian inversion to a stable of lithologic guidelines in an examination of seismic data rarely seems to be right stuff of titles. Yet when the seismic data you are determining arised from Mars, and also when your reasoning proposes that the most effective description for all of them is actually liquid water in the pores between rocks, you have a tale. There is dwarfs crave extra, when it involves global scientific research, than water on Mars. Why performs the prospect prompt such pleasure-- and also what does this brand new research contribute to the story?