.THE app of Bayesian contradiction to a range of lithologic guidelines in an assessment of seismic records hardly seems to be the stuff of headings. But when the seismic data you are actually examining come from Mars, and when your thinking proposes that the greatest description for them is actually liquid water in the pores in between rocks, you have an account. There is actually dwarfs crave even more, when it concerns global scientific research, than water on Mars. Why carries out the prospect provoke such excitement-- as well as what does this new investigation add to the story?