Quirks & Quarks · Analysis NASA says they've discovered the clearest evidence of potential life on Mars to date, but as history shows, finding actual proof of life remains a difficult task. Bob McDonald looks back at the many times scientists previously thought they'd found life on the Red Planet Listen to this article Estimated 4 minutes The audio version of this article is generated by AI-based technology. Mispronunciations can occur. We are working with our partners to continually review and improve the results. NASA's Perserverance captured this view of the 'Bright Angel' formation where the rover collected a sample that scientists say could be evidence of 3.5-billion year old life. (NASA/JPL-Caltech) Scientists are excited over the latest geological evidence for the existence of life on Mars. But as we have seen many times in the past, the Red Planet guards its secrets closely with the possibility of non-life explanations for the formations.…