"Louie the rat likes making useful things out of not-so-useful things. But none of the other rats seem to appreciate his crazy inventions, which often turn out to be not so useful after all. So when Louie notices his fellow rats wearing fancy, colorful hats -- huge hats that don't fit through doorways, heavy hats that are difficult to walk in, ridiculous hats that make it impossible to see -- Louie decides to make hats that are USEFUL. He makes wool...