Bergner heard a talk by Darryl Seligman, National Science Foundation postdoctoral fellow at Cornell University in Ithaca, New York, about what kinds of molecules might provide the best acceleration.

Source: https://krdo.com/news/2023/03/23/what-sent-an-interstellar-comet-zooming-by-our-sun-6-years-ago/

Under the norms of polite academic discourse, if Loeb disagreed with Bergner and Seligman, he would have welcomed their contribution and promised to explain his objections in due course in a peer-reviewed journal article.

Source: https://www.nytimes.com/2023/08/24/magazine/avi-loeb-alien-hunter.html