Why do we dream? Is the glass half full or half empty? Why do people love scary movies? Why do good guys finish last? Do you remember how you were born? The complex processes going on in our heads fascinate scientists around the world, but the basic theories of psychology are often so complex that they are practically incomprehensible to the casual reader. This book provides answers to questions that have troubled people for many centuries in simple language accessible even to children. Each chapter is divided into key concepts, questions and facts that are reflected in how we behave in our daily lives, why we do certain things. The answers are inside!