Daniel H. Pink's book "WHEN," which explores the science of timing and how it influences our lives. Pink argues that there are hidden patterns in the day that can be used to improve our productivity and well-being. He examines the effects of different times of day on performance and mood, highlighting the importance of vigilance breaks and restorative breaks to combat the afternoon "trough." He also examines the impact of beginnings, midpoints, and endings on our actions and decisions. In addition to discussing our individual chronotypes, Pink explores the role of group timing and synchronization, arguing that it plays a vital role in success. Ultimately, the book aims to provide readers with practical strategies for harnessing the power of timing to live richer, more engaged lives.