What have we learned from the discovery of liquid water on Mars?

(Phys.org)—One of the biggest and most important findings made by NASA recently was the confirmation that liquid water currently flows on Mars. Scientists suspected this a long time ago, but really strong evidence was needed to confirm this hypothesis. Now, with the discovery of hydrated minerals on downhill flows, which are known as recurring slope lineae (RSL), we know that liquid water not only existed in the past on Mars, but also flows there in present day. But how does this breakthro