When engineers want to make an object weigh less, they literally cut corners. Using a tool called topology optimization, they enlist computers to snip as much material as possible from the inside of objects, reducing the number of spokes on a bicycle wheel, for example. But current methods can only optimize simple objects such as brackets and pipes. Now, a team of researchers says it has created a new method of paring down large-scale objects. The below video by Science Magazine explains how.