Twenty years after "The Impact of Chaos": what have been achieved and what should be answered

Twenty years has passed since the book of "The Impact of Chaos on Science and Society," edited by Prof. Celso Grebogi and Prof. James A. Yorke, has been published. This book had influenced the researches held during the FIRST program and have been influencing the current researches following them. Thus, I would like to summarize how the questions posed in the book have been answered partly by our current generation and what questions and the other emerging questions should be considered by the next generation.