THE footprint of life on Mars may have been plain to see all along in the sulphurous minerals that litter the planet's surface. What's more, the next Mars lander should be able to detect the evidence.
NewScientist: Martian sulphur an indicator of life?
NewScientist: Martian sulphur an indicator of life?
http://www.newscientist.com/article/mg2 ... -face.html