Put something about Destiny in here so the offtopic crybabies will take a chill pill. It's water, sure. This isn't something really new, we know Mars has polar caps and subsurface ice. What's that, it's ice that comes and goes. It forms and evaporates. We've all known about this... So the 'new' discovery is water from ice that trickles down slopes and evaporates. It's seasonal. I'm not sure how life can decide to start inside water that is freezing cold (and about to evaporate soon) on a very dry planet that lacks a thick atmosphere/ozone/magnetic field and is constantly bombarded with unfiltered solar and cosmic radiation, ranging in temperatures of 70 degrees to well over a hundred below zero (Fahrenheit.) It would have to exist somewhere underground, maybe beneath Gale Crater.