A team of U.K. researchers have developed robotic fish that they plan to use to detect pollution. The researches plan a trial of five robotic fish in the northern Spanish port of Gijon. If successful, they hope to use the fish in waterways worldwide. Unlike earlier models, which had to be remotely-controlled, these new carp-shaped robots are autonomous. They cost $29,000 each, and are equipped with sensors to detect potentially hazardous pollutants. Data will be transmitted back to the shore using wi-fi. Before