1. According to the watermelon query video, as of June 4, 2023, there were 65 episodes of the dialogue between the Yellow Emperor and Liang Dong, which has been finished.

2. Huangdi Neijing is a book based on China's ancient philosophy and talk about life's law, which discusses viscera, meridians, etiology, pathogenesis, symptoms and signs, diagnosis, treatment principles, acupuncture and other contents. It's a book on ancient medical skills. It also includes astronomy, geography, psychology, sociology, history and so on.