.THE app of Bayesian contradiction to a stable of lithologic specifications in an examination of seismic data rarely seems right stuff of headlines. But when the seismic data you are examining stemmed from Mars, and when your thinking advises that the very best explanation for all of them is liquid water in the pores in between stones, you have a story. There is little people crave extra, when it concerns nomadic science, than water on Mars. Why carries out the prospect produce such excitement-- and what does this new research include in the account?