This story is from The Pulse, a weekly health and science podcast. As a kid growing up in southern California, Don Arndt always loved the ocean. “I’ve always been fascinated with fish,” he said. “My ...

It's dazzling on the sandy floors of the ocean, but it's a nightmare for its prey. The bobbit worm is a gorgeous creature, but striking and deadly. It slices fish in two using its retractable ...