.THE APPLICATION of Bayesian inversion to a series of lithologic parameters in an assessment of seismic records rarely seems to be right stuff of titles. But when the seismic information you are examining originated from Mars, and also when your reasoning suggests that the greatest description for them is actually liquefied water in the pores between rocks, you possess an account. There is actually dwarfs crave even more, when it comes to planetal scientific research, than water on Mars. Why does the prospect produce such excitement-- and what performs this new investigation contribute to the story?