The population of river-dwelling Arctic grayling has rebounded from earlier this century but challenges remain, especially with cuts in personnel and funding at the U.S. Fish and Wildlife Service.

A Galaxy S23 Ultra spent five hours underwater in a freezing Arctic river and still worked perfectly. The phone’s IP68 rating doesn’t cover those conditions, making the survival more surprising.

Cave data shows the Arctic was permafrost-free when Earth was 4.5˚C warmer, hinting at what rising temperatures could bring.