This document discusses how our thinking is influenced by two brains - the primitive elephant brain and the executive rider brain. It explains that we detect patterns even when they are not really there, and our senses can lead to contradictory interpretations. We also ignore most of the sensory data we take in. The document then discusses several cognitive biases like framing bias, availability bias, anchoring bias, and correspondence bias that influence our thinking. It notes that understanding these unconscious influences is important for making them conscious so they do not dictate our lives without our awareness.