The lab-leak theory isn’t singular; rather, it’s a catchall for a continuum of possible scenarios, ranging from the mundane to the diabolical. At one end, a researcher from the Wuhan Institute of Virology might have gone out to sample bat guano, become infected with a novel pathogen while in the field, and then seeded it back home in a crowded city. Or maybe researchers brought a specimen of a wild-bat virus back into the lab without becoming infected, only to set it free via someone’s clothes or through a leaky sewage pipe. The microbiologists Michael Imperiale and David Relman, both former members of the National Science Advisory Board for Biosecurity, told me several weeks ago that lab-leak scenarios of this rather more innocent variety—involving the collection and accidental release of a naturally occuring pathogen—were the most probable of all the non-natural possibilities. Yet the most prominent opinionating on this topic has clustered at the other end of the continuum, at first around the dark-side theory of a bioweapon gone awry, and then around the idea that a harmless virus had been deliberately transformed into SARS-CoV-2 (and released by accident) after a reckless series of tabletop experiments. That’s another pitfall in this debate: a tendency to focus only on the most disturbing and improbable versions of the lab-leak hypothesis, and to downplay the rest. The mad-scientist trap sprays a mist across the facts by presuming scientific motivations; it posits that researchers could have caused the pandemic only if they’d been trying to create infectious pathogens.