This video says about itself:
Unlike previous rovers to Mars, Curiosity is a robot chemist seeking evidence of past habitability on Mars.
See also here.
ScienceDaily (July 27, 2012) — Debate over the origin of large-scale polygons (hundreds of meters to kilometers in diameter) on Mars remains active even after several decades of detailed observations. Similarity in geometric patterns on Mars and Earth has long captured the imagination. In this new article from GSA Today, geologists at The University of Texas at Austin examine these large-scale polygons and compare them to similar features on Earth’s seafloor, which they believe may have formed via similar processes: here.
Mars landing live blog: here.