By Rick HowlettAn estimated 700,000 people lined the banks of the Ohio River Saturday night for the annual Thunder Over Louisville air and fireworks show. The fireworks display, touted as one of the largest in the world, was delayed nearly 20 minutes by a computer malfunction, but went off without any problems once the issue was resolved. Thunder Over Louisville is the official kickoff of the two-week Kentucky Derby Festival.Festival activities continue Sunday with the grand re-opening of the Kentucky Derby Musuem, which has been undergoing a renovation since it was damaged by a flash flood last year.(File photo courtesy of the Kentucky Derby Festival)