What is the benefit of teaching a lesson to someone else?

Teaching a lesson to someone else reinforces the teacher's understanding of the material by requiring them to process and articulate the information clearly. When you explain a concept, you must organize your thoughts and connect different pieces of information, which solidifies your understanding and helps you identify gaps in your knowledge. This active engagement with the material not only aids in retention but also allows for a deeper exploration of the subject, as teaching often prompts questions and discussions that enhance comprehension.

While there may be emotional benefits from teaching or the possibility of credit, the primary educational advantage lies in the reinforcement of one's own learning. In this scenario, minimizing forgetfulness is a consequential benefit, but the core reason teaching solidifies knowledge is through the process of explaining and engaging with the material. Thus, the correct answer is rooted in the cognitive benefits that arise from the act of teaching itself.