First came the kina, hordes of them taking down kelp forests in shallow waters. But they were a warm-up act. Now, on the deeper reefs, a much bigger, hungrier urchin is going rogue—and once it’s eaten ...

Nature does it again! The natural world has a knack for giving us the blueprints for some useful technologies, and the humble sea urchin is the latest contributor. Scientists have designed a new class ...