The document discusses thinking skills and research. It argues that while individuals are born with the same brain, some people are smarter than others due to differences in opportunities to develop thinking skills. It states that intelligence and the ability to understand can be improved throughout one's life by making an effort to learn and understand new things each day. The document also emphasizes the importance of learning how to learn skills, which allow a person to learn new subjects even without prior knowledge in that area. Several techniques for improving thinking skills and how to learn abilities are provided, such as examining extreme cases, considering fundamental laws of physics, and thinking in an interconnected way.