Explore the possibility of life on Mars through a captivating 20-minute TED talk by scientist Penelope Boston. Delve into the intriguing hypothesis that Martian caves could harbor life, despite the Mars Rovers' inability to detect alien lifeforms on the surface. Learn about Boston's estimated 25 to 50 percent chance of life existing deep within the planet's caverns, and discover the methods and reasoning behind searching for life in these subterranean environments. Gain insights into the potential for extraterrestrial life and the importance of expanding our search beyond the Martian surface.