A growing number of metropolitan areas are incorporating urban density and connectedness into their innovation strategies by fostering innovation districts devoted to research commercialization, entrepreneurship and housing for highly skilled workers, according to a new report from the Brookings Institution. The districts combine the concentrated research activities of science parks with the accessibility and economic ties of city neighborhoods. These districts, which have emerged in the heart of Detroit, Houston, Pittsburgh and others, offer desirable work and living environments for talented workers, valuable connections for researchers and entrepreneurs, and strong potential for regional economic transformation for metro areas.