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The reason I want to see a blade on a rover goes back to Spirit. Near the end of its mission it had a busted wheel. Dragging it around caused a little trench behind the rover that wasn't more than an inch deep. In that trench we saw silica deposits unlike anything on the surface. I'd like to see more of what's under there. Drilling into rocks shows us what was captured when the rock was formed, and surface photograph show what things look like after millennia of weathering. There is a huge time gap in the middle that we can't see.
(I am not a scientist or an expert.)
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