.THE app of Bayesian inversion to a series of lithologic parameters in an examination of seismic data barely seems the stuff of headings. But when the seismic records you are examining originated from Mars, and when your thinking proposes that the best illustration for them is actually liquid water in the pores between rocks, you have a story. There is little people crave even more, when it pertains to planetary science, than water on Mars. Why does the possibility prompt such exhilaration-- and also what does this brand-new study contribute to the account?