On the day you were born, you arrived with your own unique biology and into your own unique social and cultural context. It would have been impossible to predict on that day how your life would unfold, or exactly the person you would become in the future. Why? Because there are so many complex and interrelated factors in the development of each and every human being. In his new book, The Human Spark: The Science of Human Development (Basic Books, 2013) world-renowned psychology professor Jerome Kagan tackles some of the most fascinating and important questions about what makes a human a human, and how we become who we are over the course of our lives. He draws from his decades of experience in developmental psychology, as well biology, neuroscience, and even literature and biographies, to inform his nuanced and big-picture view. And never one to shy away from critical thinking, Kagan also provides thoughtful remarks on the limitations of psychology as a field of research. If you want to listen to a person with an amazing mind and decades of experience talk about psychology, this is the interview for you!