battery powerful enough to last all day, but also small enough to fit into ive's slim case design. >> dan riccio: every tenth of a millimeter in our products is sacred. >> rose: every tenth of a millimeter is sacred... >> riccio: with this design, it involved, you know, mechanical and it also involved software engineers to go off and design a pack that would fit within the surfaces with... of the product, but still work reliably. >> rose: one of the most complex engineering challenges at apple involves the iphone camera, the most used feature of any apple product. that's the entire camera you're looking at in my hand. how many parts are in here? >> graham townsend: there's over 200 separate individual parts in this... in that one module there. >> rose: graham townsend is in charge of a team of 800 engineers and other specialists dedicated solely to the camera. he showed us a micro suspension system that steadies the camera when your hand shakes. >> townsend: this whole autofocus motor here is suspended on four wires. and you'll see them coming in. and here we are. four... these are 40-micron wir