"Data from NASA's Phoenix Mars Lander suggest liquid water has interacted with the Martian surface throughout the planet's history and into modern times. The research also provides new evidence that volcanic activity has persisted on the Red Planet into geologically recent times, several million years ago."
COMMENT: We see Mars differently every time we look at it. It's a far more active and complex world than we understood just a few years ago. Humans need to go see it for themselves. I'd volunteer.