Various shots from different angles in a laboratory of the Freshwater Institute in Winnipeg, of a man at work in a dark room checking four wheels of bottles of samples subjected to different amounts of lights, of the bottles turning on wheels. Several CSs, ECSs of a colorimeter, of tubes with colored liquids in, moving through. MCSs of a technician watching tubes. Various shots of a graph readout, of a woman typing on a computer console with CSs of the screen.