What is it, precisely, that makes you unique? TIME probes the science of human development in search of answers and identifies the major factors that shape your personality and thought patterns. You can learn why some people are introverts and others extroverts and why some people lack confidence while others have it in abundance. You can discover how genetics, physicality, brain function, family, cultural and social influences - including surprising factors such your dreams and what you consume-define the science of YOU.