Techonomy Detroit is back with its third annual conference exploring how technology boosts U.S. competitiveness, jobs, growth, and urban revitalization. Confirmed speakers include Jennifer Bradley of the Brookings Institute; Stacy Brown-Philpot, COO of Task Rabbit; Jack Dorsey of Twitter and Square; Harvard Business Review executive editor Justin Fox; and Zach Sims, founder and CEO of Codecademy. For registration and details, click here.