CellBioGuy comments on Open thread, Sep. 28 - Oct. 4, 2015 - Less Wrong Discussion
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https://www.nasa.gov/press-release/nasa-confirms-evidence-that-liquid-water-flows-on-today-s-mars
Evidence of seasonal flows of small amounts of extremely briny water full of perchlorates on the surface of Mars.
They don't know if it's coming up from some kind of underground aquifer, seasonal subsurface ice melt, or the high salt content of the soil pulling out seasonal humidity from the air and producing transient moist soil layers that then leak out at suitable locations.