eldavojohn writes: "Further reinforcing the theory of a wet Mars, NewScientist is reporting on what appear to be water puddles in newly taken images from the Mars rover. While these results are controversial, the assumption for these blue 'puddles' to be water rely on engineers measuring the uniform smoothness of the surface of them & also in their analysis of apparent opaqueness whereby in some areas they claim to see pebbles underneath the surface of the blue areas. Truly water resisting the temptation to evaporate off the face of Mars or merely an anomaly of stereophotography gone wrong? We'll have to wait and see as the "Face on Mars" has taught us not to trust your eyes when viewing the red planet."
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egrep patterns are full regular expressions; it uses a fast deterministic
algorithm that sometimes needs exponential space.
-- unix manuals