The article talks about how our brains have two ways of thinking: one that's quick and automatic, and one that's slow and careful. Different scientists have presented various ideas about these two thinking styles, suggesting they might come from two separate brain systems. Some theories say these two ways of thinking compete with each other, while others say the fast one influences the slow one without us realizing it. But, there are many types of quick, subconscious thoughts, and not all fit neatly into this dual-system idea. Overall, the research points out that our brains can process information in different ways, sometimes automatically and sometimes deliberately, shaping our decisions and reasoning in complex ways.