What the invention of Nicaraguan Sign Language teaches us about the human brain

Sign languages tend to spontaneously emerge when the deaf people of a country or region first start coming together to form a community, usually based around a school. It's happening right now in Nicaragua, where special education schools opened in the 1970s. Over the past 30 years, Nicaraguan Sign Language has evolved from simple gestures between friends, to a full and complete language. That recent evolution makes Nicaraguan Sign Language the enticing blue bug zapper to linguists' and cognitive scientists' curious moths. Case in point: The study of the way language and learning interact. The structure and composition of the language you speak has a big impact on how you think and perceive the world.