In this episode of humanOS Radio, Dan hosts a discussion with Professor Antonio Nunez exploring the work and he and his colleagues are doing looking into how environmental light can lead to structural changes in the brain. For the great majority of us who aren't spending our days hunting and gathering, this could have important implications for our health and perhaps our productivity. The Environmental Protection Agency has reported that Americans spend, on average, about 90% of their time indoors. Is it possible that spending too much time in dimly lit rooms and offices is affecting our ability to learn? Might environmental light be involved in the regulation of cognitive performance and mental health?