Andrew McAfee is a scientist at MIT. His work investigates how digital technologies are changing the world. His most recent book is "More from Less: The Surprising Story of How We Learned to Prosper Using Fewer Resources — And What Happens Next" He is the coauthor, with Erik Brynjolfsson, of the New York Times bestselling book "The Second Machine Age: Work, Progress, and Prosperity in a Time of Brilliant Technologies."