The shells of chelonians—think turtles, tortoises, and sea turtles—grow in layers, keeping a time-stamped record of environmental conditions. Uranium has shown up in the layers of turtles’ and ...

When we picture sea turtles in the wild, it’s easy to envision them as armored warriors – their hard, resilient shells serving as near-impenetrable shields against oceanic threats like sharks. These ...