We talk about mental models. Marius has a revelation about how mental models relate to machine learning models and AI. Some existentialism where we try to think what impact is and how can we make an impact on the world. Quoting Elon Musk: "It doesn't have to change the world. ", "Even if it's just a little game or some improvement in photo sharing...". Everyone has their purpose. Some of us never reach our full potentials though or end up chasing something that would totally fail in the end. But it is important to try.