Silicon Valley is the nation's top dog for innovation: study

Silicon Valley is tops in the country for patents per employee, a study by the Brookings Institution shows. By this and other key metrics, the area is No. 1 in a survey of 358 metropolitan areas. What's more, it has been on top every year starting in 1988, Brookings reported in its survey, the first of its kind to measure patent output in U.S. metro centers....