This episode of Radiolab, part of a week-long series inspired by the 50th anniversary of "Jaws," features a discussion about the cultural impact of shark movies and a firsthand account of cage diving with great white sharks. The hosts explore the proliferation of monster shark films following "Jaws," highlighting the absurdity and creativity within the genre. One of the hosts recounts their experience traveling to South Australia and joining a shark cage diving expedition, detailing the anticipation, initial disappointment of not seeing any sharks, and eventual encounter with a smaller white shark. The episode also delves into the evolutionary history and diversity of sharks, emphasizing their ancient origins and the wide range of species that exist today. The episode concludes with a promotion for Radiolab's membership program and a preview of the next day's episode.