"10% Human" by Alanna Collen, which examines the profound impact of microbes on human health and happiness. The book explores how our gut microbiota, the trillions of microorganisms that live within us, play a crucial role in everything from digestion and immunity to mental health and even our susceptibility to chronic diseases. Collen traces the history of our understanding of microbes, from the early days of germ theory to the latest breakthroughs in DNA sequencing and microbiome research. She delves into the fascinating ways our microbiota influences our lives, from shaping our immune system and influencing our moods to potentially affecting our weight and even our social behavior. The book presents a compelling argument for rethinking our relationship with microbes and adopting a more holistic approach to health, one that recognizes the importance of nurturing a healthy and diverse gut microbiome.