The Night the Whole Bay Burned Blue

On certain nights in Mosquito Bay, Puerto Rico, the water catches fire — not with flame, but with light. Millions of dinoflagellates, single-celled organisms no larger than a grain of sand, erupt in bioluminescent blue whenever the water stirs. Drag your hand through the surface, and your fingers trail ribbons of cold fire. A kayak leaves a glowing wake. Every ripple becomes a constellation.…