Mia and Michael are busy with their coloring book when the Fish asks them what at first sounds like a very simple question: What color are they going to paint the water on one of the pictures? The children are certain it has to be blue, but the Fish offers them many new ideas to consider: for example, there is the Yellow River and the Red River in China; the Black River and the White River in Russia; and, finally, a lake in Tunisia where the water...