Old women have more cats than most people. So more old women means more cats. Cats eat mice, and mice eat young bees. So more old women means more cats, fewer mice, and more bees. For good grass, you need clover – and for lots of clover, you need bees. So more old women means more cats, fewer mice, more bees, more clover, and better grass. And better grass means fatter cows. So in the end more old women means better grass and fatter cows.