It is?
Who made that claim?

It seems the image attached to the NewScientist article is not an image from Levin's yet to be published paper.

And I'm not entirely sure how but this article appears to address how puddles might form (and evaporate) on the Martian slopes.

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"Where the telescope ends, the microscope begins. Which of the two has the greater view?" - Hugo

"Men occasionally stumble over the truth, but most pick themselves up and hurry off as if nothing had happened." - Churchill