Among all the hoopla surrounding the latest Mars explorer, what I
haven't heard is what this one will do that the previous ones didn't?
The pics sure look pretty much the same. There were rocks there 25
years ago and sure enough, they're still there

Have the rovers all landed in the same place?

If not, then ask youself this:

If you live in the Midwestern US, do you *really* expect the ENTIRE planet
Earth to be just like your piece of Ohio?

The truth usually points to itself.

This isn't an island, it's not a new continent, it si a PLANET. It is HUGE.
And the rovers (three by the US, so far) are landing in different places, none
of which are where Viking set it's landers at. That is FIVE comepltely
different places. Viking was able to photograph a few miles distant, but take
samples only within a few feet. the Rovers aren't going more than a few hundred
yards from their starting point.

Imagine trying to describe a place when you only have pictures from orbit
and samplings from less area than the size of a dozen football fields.

Could you *really* describe this place, accurately, with that little
information?