Opportunity rover discovers shark-teeth-like rocks sticking up from the sides of a trench-like structure. It is the only structure of this kind ever seen on Mars and possibly a result of water-based mineral deposits of the past. And what does the damned rover do? Runs right over the "teeth" rocks, messing them all up. Jesus, the rovers are worse than my 4-year-old. At least the 4-year-old keeps his destruction limited to earth goods.