Some of history's most ambitious projects began with an invitation: help fund this idea, or show us how to solve this problem. Challenge US follows the people who answered those calls, the sponsors who backed them, and the obstacles they faced along the way.
Drawing on historical research and his experience with public-sector innovation, Lance McNeill explores how crowdfunding and challenge prizes can bring more people into the work of building a better future. The stories offer lessons for anyone designing a competition, supporting a project, or deciding where to put their own time and talents.