http://www.sfn.org/bavcMost of us could tell our best friend apart from our grandmother simply by looking at their faces. But for people with prosopagnosia, this task could be impossible. Also known as face blindness, prosopagnosia is a cognitive disorder characterized by an inability to recognize faces, and it affects about 2.5 percent of the world’s population. Find out more in this video created by high school student Swathi Pavuluri for the 2015 Brain Awareness Video Contest.