If you want to walk 10 feet you have to walk 5 feet first. Before you can walk 5 feet you have to walk 2.5 feet first. Before you can walk 2.5 feet you have to walk 1.25 feet first. and so on. Before you move 1 inch you have to move 0.5 inch first. And then 0.25 inch. and so on. before you...