The emerging science of implicit bias is one of the most promising fields for animating the human change that makes social change possible. The social psychologist Mahzarin Banaji is one of its primary architects. She understands the mind as a “difference-seeking machine” that helps us order and navigate the overwhelming complexity of reality. But this gift also creates blind spots and biases, as we fill in what we don’t know with the limits of what we do know. This is science that takes our grappling with difference out of the realm of guilt, and into the realm of transformative good.