Humans are both amazing and limited creatures. Any understanding of life needs to start with an understanding of how the world works and how we ourselves work. Did you know that we have programming errors built into our brains where we will consistently and predictably make mistakes in certain situations? These “cognitive biases” are a rich field of study in psychology. Section 2 explores this and other topics to help you develop your own theories of how both you and the world work. Like a scientist, if you have a theory, you can test it over time and refine it as you learn more.