How to tell Earthlings that Martian life is here 18:40 01 August 2006 NewScientist.com news service David Shiga The Spirit and Opportunity rovers that continue to explore Mars are not designed to search for life. But if a sample return mission is ever sent to Mars, scientists could test for it in the rocks brought back to Earth. In 1996, news of possible signs of life in a Martian meteorite called ALH84001 leaked out ahead of a press conference that had been scheduled by NASA. This was partly because a high-ranking White House official told a prostitute about the meteorite....