What if a great metropolis was built not of stone, but of bone? An entire city, constructed by its own inhabitants. Dr. Thorne hovers in the midnight water, his torch beam revealing a thousand tiny, flower-like mouths. They wave gently in the dark, capturing invisible specks of food from the current. This is the coral polyp, the soft-bodied animal at the heart of the reef. By day, it retracts,...
