People who believe the coronavirus was manufactured in a lab haven't been allowed to say so on Facebook since February until Wednesday, that is, when Facebook announced it was lifting the ban. Presumably this has something to do with the wavering elite consensus on lab leaks. This consensus was never as monolithic as proponents claimed. But it did produce a Facebook ban and a lot of journalism dismissing the hypothesis as a well-debunked conspiracy theory. In one light, this is a happy scientific ending. Over time, with study, natural transmission looked less likely, and a lab accident somewhat more so. As the evidence changed, a previously hard-and-fast consensus became more open to other possibilities, as should be the case for any good scientific theory. But in another light, this story is a disaster. How did so many smart people come to believe, not just that a natural origin was much more likely than a lab leak " which is still, to be clear, the opinion of many scientists " but that a lab leak was basically an impossibility? Labs have leaked deadly viruses in the past. And a lab in the same city where the pandemic began happened to study bat coronaviruses and had a sample of this coronavirus's closest known relative, gathered from a cave hundreds of miles away. It's possible, and maybe even probable, that this was pure coincidence. But it is a hell of a coincidence, and it wasn't kooky to say so.