The 51-year-old computing principle is now butting heads with the realities of physics and economics.In 1965 Gordon Moore, who would go on to co-found Intel, wrote a paper in which he described what has become known as "Moore's law." It stated that the number of transistors on a microprocessor will double roughly every two years, meaning, in theory, that every two years the processors inside our devices would get twice as fast and be able to do twice as much.