For more than a decade, there's been something fishy going on in a lake that straddles Vermont and the province of Quebec. It involves cancer, a kind of catfish, and — possibly — clues about how tumors metastasize.
Source: [NPR News](https://www.npr.org/2026/07/22/nx-s1-5901135/transmissible-cancer-catfish-melanoma-tumors)