Roland Piquepaille writes: "Today, both submarine and surface ships use sonar for navigation. But sonar and other vision systems face various limitations. So why not imitating fish? For millions of years, fish have relied on 'a row of specialized sensory organs along the sides of their bodies, called the lateral line' to avoid predators or to find preys. So engineers at the University of Illinois at Urbana-Champaign (UIUC) have decided to build an artificial lateral line for submarines and autonomous underwater vehicles (AUVs). The first tests have been successful, and we can now envision a day where AUVs could detect and track moving underwater targets or avoid collisions with moving or stationary objects. Read more for additional details and a picture showing a future model of autonomous underwater robot using a artificial lateral line."