G'morning DAVID WILLIAMS,

 ->  PQ> Ahh... but is it sand and dust flowing as if in a fluid motion?
 -> That's what I `saw' when their photos reached me - very common
 -> sight in the sand dunes at my favourite beach...

 DW> Sand and dust does that partly because air or other fluid gets between
 DW> the grains as they're moving, acting as a lubricant. It might not work
 DW> in the very rarified atmosphere of Mars.

Fair enough.  It'd be nice to have one of the robots to experiment 
with that geological feature to attempt a replication of a dry 
slip...

Better still, a human explorer to do what humans do to find out...

Miles. 
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