In 2016, a blind woman was injected with light-sensitive proteins from algae to restore her vision. Optogenetics is a groundbreaking technology that allows scientists to control cells and proteins in real time with light. Its uses are many – from creating new therapeutics to learning how the brain controls behavior. So how does this technique work? What are its strengths and limitations, and what will we do with it? Join three scientists from the University of Colorado as we explore the exciting world of optogenetics.