When I tell people I wrote a book with my dad, they usually say, “It must be nice to think of the legacy ( 留下来的东西 ) you created with someone who means so much to you.” This was a beautiful idea, but it was not the way I, or my dad, ever thought about the cooperation. Though we created something we’re proud of, “nice” is not the word either of us uses to describe the process. “It was more confrontation ( 对抗 ) than cooperation,” my dad likes to say. I agree. When we landed a book deal, we began a writing journey that was more difficult than either of us had anticipated, but also far more rewarding. For almost three years, we met once or twice a week at my parents’ house and talked daily to plan and outline each chapter. After these meetings, one of us would write a rough draft that the other would build on. I wanted the book to focus on positive vices ( 不良习惯 ): such as moderate ( 适度的 ) chocolate. However, my dad felt the book should include chapters dealing with things like walking and spending time with family. Ultimately ( 最终 ), I saw it his way. He said the book was about more than just good vices. It was about encouraging people to enjoy life in healthy ways. Writing this book was a reminder that our family members share not only our faults but also our strengths. My dad is smart, funny, critical and caring. He has a strong passion for the truth. I hope I share these great qualities. For this book, he researched each topic with an enthusiasm I’d never seen from him, and he insisted that we constantly question and critically analyze every piece of information – even our own conclusions. He was determined to cooperate with me on a book, not because he couldn’t write one on his own, but because he believed that we could create something better together than we could alone. I’m not sure if our cooperation led to better writing, but I’m sure it led to a better writing experience. Writing this book was difficult, sometimes more difficult than past projects, but it was never lonely.