Curiosity identifies Earth-like rock - and has its first carwash

The first rock to be touched by NASA's Curiosity rover - dubbed Jake Matijevic - turns out to have a very Earth-like composition, different to anything before seen on Mars.

Early Mars not so wet after all

One of the most encouraging signs for those searching for evidence of early water on Mars has been the existence of clays. But a French-US team has now rained on that particular parade.