HARI SREENIVASAN: Now a new effort to shed light on a mystery that has long baffled scientists who study the world's oceans and waterways. Researchers are using some very sophisticated robots to understand what's happening with microscopic marine life. Special correspondent Cat Wise has the story, part of our weekly series covering the Leading Edge of science and technology. CAT WISE: At the Crab Cove Visitors Center in Alameda, California, the main attraction is, no surprise, crabs. CAT WISE: On a recent afternoon, a group of children on a field trip at the center headed outside to the nearby beach with naturalist Morgan Dill for a talk on the creatures of the cove.