Since Darwin, solving the mystery of life’s origins has been the quest of scientists in fields as diverse as astrobiology and zoology. This riveting program presents a fascinating glimpse into what might—or might not—be the smallest, most primitive living organisms. The program also serves as a case study in applying scientific method to advance radically new propositions, from initial discovery through hypothesis to funding and commercial applications. Dr. Philippa Uwins, a geologist who discovered these "nanobes" in rock samples, defends her findings against the criticism of such fellow scientists as Professor Kenneth Nealson of NASA. (54 minutes)