S2E3 From Spillover to Weapons: A Conversation with Conor Browne on Biological Threats

What are biological weapons—and what are they not? In this episode, Heather is joined by bio-risk consultant and biodefense researcher Conor Browne for a grounded, reality-based conversation about biological weapons, biodefense, and why public discourse around these topics so often goes wrong. Together, they unpack what actually defines a biological weapon, why intent and delivery matter, and how real historical programs differ from the conspiratorial narratives dominating social media and politics. They explore state and non-state capabilities, the real constraints involved in weaponization, and why most pathogens—even deadly ones—are not practical weapons. The conversation also tackles some of today’s most misunderstood ideas, including gain-of-function research, lab accidents versus deliberate release, dual-use research of concern (DURC), and the limits of attribution when outbreaks occur. Along the way, Conor explains why sloppy language isn’t just misleading—it can actively undermine public health and national security. This episode is a clear-eyed look at biological threats without fear-mongering, designed to replace panic with understanding and precision. Topics covered include: What actually qualifies as a biological weapon Why dangerous pathogens ≠ weapons Historical bioweapons programs and what they really looked like State vs. non-state actor capabilities Why lab accidents are not weapons Gain-of-function research, DURC, and political distortion How misinformation increases real biological risk