Granular flows at recurring slope lineae on Mars indicate a limited role for liquid water

@article{Dundas2017GranularFA,
  title={Granular flows at recurring slope lineae on Mars indicate a limited role for liquid water},
  author={Colin M. Dundas and Alfred S. McEwen and Matthew Chojnacki and Moses P. Milazzo and Shane Byrne and Jim N. McElwaine and A. C. Urso},
  journal={Nature Geoscience},
  year={2017},
  volume={10},
  pages={903-907}
}
Recent liquid water flow on Mars has been proposed based on geomorphological features, such as gullies. Recurring slope lineae — seasonal flows that are darker than their surroundings — are candidate locations for seeping liquid water on Mars today, but their formation mechanism remains unclear. Topographical analysis shows that the terminal slopes of recurring slope lineae match the stopping angle for granular flows of cohesionless sand in active Martian aeolian dunes. In Eos Chasma, linea… 
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The presence of liquid water is a requirement of habitability on a planet. Possible indicators of liquid surface water on Mars include intermittent flow-like features observed on sloping terrains.
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Active dark flows known as recurring slope lineae have been observed on the warmest slopes of equatorial Mars. The morphology, composition and seasonality of the lineae suggest a role of liquid water
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TLDR
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One of the major Mars discoveries of recent years is the existence of recurring slope lineae (RSL), which suggests that liquid water occurs on or near the surface of Mars today. These dark and narrow
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