These chips won't be blazing through Crysis any time soon, but there's certainly room in the world for mechanical nanocomputers
, and thanks to DARPA we might seem them in the real world sooner rather than later. The chips harken back Babbage's 13 ton difference engine, but with a whole lot more nano. They're also more robust, generate less heat and consume less power than their solid-state counterparts. DARPA has plenty of uses for them on the battlefield (like counting bullets, oddly enough), and consumers might seem them showing up car engines and children's toys.