On Mars, no proof yet, but scientists’ search for extraterrestrial life continues

Curiosity’s suite of instruments is not designed to detect life itself. NASA learned a lesson in the 1970s when it plunked two Viking spacecraft on Mars and performed much-ballyhooed tests that might have detected life. The results were ambiguous at best; most scientists interpreted the findings as negative. NASA learned that it is hard to get funding for future robotic missions when the first wave of probes saw only a cold, dry, dead-looking place. Read the entire story: http://www.washingtonpost.com/national/health-science/on-mars-no-proof-y...