Hi Friends, What if the water/permafrost explanations about gullies are wrong? Looking at the "gummy" looking soil exposed by the Spirit rover and the airbag drag marks, and hearing the reports that there's no appreciable moisture, reinforces my notion that the gullies may have a non-H2O explanation. The soil around Spirit is extremely fine but cohesive, and some scientists have attributed the cohesion to electrostatic properties of the dust. Maybe its iron content and the enormous friction created by incessant high winds blowing dust around have given it an electrical stickiness. In that case, I can imagine whole fields of sticky dust cascading down a steep slope and behaving much like water. Only it's not water, it's sticky dust. Anyone like to comment on that idea? Best wishes, Joe