Welcome back to our ongoing series, A Brief-ish History of SETI, where we examine the ideas and milestones that have come to define the Search for Extraterrestrial Intelligence (SETI). In Part I , we looked at the purpose and motivations for this field of study, some of the earliest experiments, and how they reflected a growing sense of curiosity about the cosmos and our place in it. In Part II , we examined the first SETI survey (Project Ozma) and its enduring legacy. We also saw how the project's leader, Professor Frank Drake (the "father of SETI"), proposed the famous Drake Equation , which remains a foundational principle of the field. In addition to summarizing the challenges facing SETI astronomers, this equation also reflected humanity's growing sense of ambition and existential anxiety, characterized by bold plans for space exploration and the fear of nuclear annihilation.…