Once the epicenter of a catastrophic nuclear disaster, Chernobyl in Ukraine was left uninhabitable for humans. But in the silence that followed evacuation, nature began to reclaim the land. Przewalski's horses, once nearly extinct, now roam freely, grazing among overgrown buildings as forests reclaim old roads. Wolves, lynx, moose, and red deer have also returned, along with free-roaming dogs and even brown bears, a species absent from the region for more than a century. Still, the recovery is not without complications. Radiation remains an invisible presence, and scientists continue to observe its subtle but lasting effects, such as birds developing...