Imagine a fish designed with such precision that it has thrived in deep, dark ocean waters for generations unchanged, resilient, and wonderfully suited to its world. That’s the coelacanth, a mysterious creature first known from fossils in ancient rock layers. For decades, textbooks claimed it had gone extinct 65 million years ago. But in 1938, the “extinct” fish stunned the scientific community when one was caught alive off the coast of South Africa. Since then, more have been...