The discovery of abundant nickel in a once waterlogged region of Mars offers yet another hint that the red planet may once have offered suitable conditions for life. In Neretva Vallis, an ancient channel that once carried water into the Jezero Crater delta, researchers found nickel in concentrations higher than ever seen before in the bedrock of Mars. Placed in its broader geological context, the metal offers clues about the chemical history of the region and adds a new piece to the puzzle of