Life leaves subtle signature in the lay of the land
Life leaves subtle signature in the lay of the land, UC Berkeley researchers report
http://www.spaceref.com/news/viewpr.html?pid=18910
"One of the paradoxes of recent explorations of the Martian surface is that the more we see of the planet, the more it looks like Earth, despite a very big difference: Complex life forms have existed for billions of years on Earth, while Mars never saw life bigger than a
microbe, if that."