Over the past 40 years, a handful of space probes has given us glimpses of Saturn. But NASA's Cassini, which explored the gas giant's realm for 13 years looping through its icy rings and flying by its moons, delivered the most breathtaking new insights. The probe captured stunning ring-moon interactions. NOVA takes you inside Cassini's epic journey as it makes astonishing discoveries: Saturn's rings are younger than the dinosaurs and may be remnants of an ice moon. And geysers erupting ice and gas on the moon Enceladus show that it could have all the ingredients for life. But to protect it, the Cassini mission team makes a bittersweet decision.

In 2018, Italy's Morandi Bridge collapsed, tragically killing 43 people. For 50 years, the iconic bridge had withstood the elements—and stress from ever-increasing traffic. What went wrong that fateful day? And how can new engineering technology protect bridge infrastructure to prevent such tragic failures in the future? Through eyewitness testimony, expert interviews, and dramatic archival footage, NOVA investigates the Morandi disaster and other deadly bridge collapses across the United States.