re: About those spheres-
From:
Http://www.space.com/missionlaunches/rover_update_040219.html
Unlike those on the surface, the spheres in the wall of the trench are "polished and shiny," said geochemist Albert Yen of NASA's Jet Propulsion Laboratory. No one knows why.
If the spheres are wet would it not make them shiny?
Johannes
