Another water on Mars story is out, this time focusing on the appearance of some gullies. These gullies appear to be being formed by processes that are more liquid than dust. Normal Martian gullies come about from carbon dioxide ice sublimating away and allowing dust in it to fall down a nearby slope. These tend to widen as the dust falls down and end in fan shapes. The new gullies start of slender and remain so. They also stop suddenly and then occasionally get restarted (these things are forming even now as seen by satellites orbiting Mars, snapping away at the same areas over weeks).
Water isn’t the only liquid that could be doing this and it certainly couldn’t last long on the surface if it was popping up, but there’s a chance something is causing it to well up. Another interesting area of study from the Red Planet.