Rapidly growing cognitive technologies (such as word processors, web browsers, cell phones, and personal data assistants) aid learning, memory, and problem solving, and contribute to every part of modern life from interviewing crime witnesses to learning a foreign language to calling one's mother. between the human mind and the tools people create to enhance it, studying which technologies assist cognition the most and what features are most effective. It also considers the point at which the technological enhancement of human ability begins to restrict that very ability, such as the risk of...