Jay Weatherill, left, premier of South Australia, talks Sunday with Don Lepard of Global Green Lighting as he explains the computer-operated lighting system his company built and installed on the Walnut Street Bridge, Coolidge Park and Frazier Avenue. Weatherill said he is interested in innovative technologies and downtown revitalization and hopes the city of Adelaide can learn from Chattanooga how to make that city more exciting and to retain more young adults.