A leaked grant proposal from the EcoHealth Alliance to the US military research agency DARPA details plans for high-risk coronavirus research, including the insertion of human-specific cleavage sites into SARS-related bat coronaviruses. The proposal was rejected by DARPA in 2018, but some scientists believe it provides evidence that the group was working on risky areas of research. The revelation has shifted the debate over the origins of the pandemic, with some scientists arguing that it tips the scales towards the possibility of a lab origin. The proposal does not provide conclusive evidence, but it has sparked renewed discussion about the potential risks and consequences of such research.