I like the science, here.  (However, note my point below).

Glauconitic-Like Clay Found On Mars Suggests the Planet Once Had Habitable Conditions (phys.org)

A team of researchers from Spain, France and the U.S. has found evidence of a glauconitic-like clay on Mars that suggests the planet once had habitable conditions. Phys.Org reports: In their ( Read more... )

"Our knowledge is a little island in a great ocean of nonknowledge."
- Isaac Bashevis Singer