This piece is part of the Slate 90, a series that examines the multibillion-dollar nonprofit sector. Read all stories from the Slate 90 here, and view the Slate 90 nonprofit rankings here. CAMBRIDGE, Massachusetts—You don’t need to drop out of Harvard and move to the West Coast to start a company anymore. You can cross the Charles River to the i-Lab, a 30,000-square-foot incubator for undergraduates that the university founded in 2011. Tech office style prevails in this building behind the vaunted Harvard Business School: open floor, whiteboards, a ping-pong table. In the da Vinci room, students can use machine tools.