Rooted

Why do no two heads of hair behave the same way, even with the same products? You have probably asked that question. Standing in the bathroom with a drawer full of products that half-work or watching the shampoo that transformed your sister's hair sit flat and dull on yours. The haircare industry has been quietly hoping you would stop asking. Hair is not a beauty product. It is biology. Every strand on your head is a thread of protein, made by a follicle in your scalp, wrapped in a cuticle of oil, and shaped by the genes you inherited from a particular corner of the world. Hair from East Asia, hair from Europe, and hair from sub-Saharan Africa are not three styles. They are three different biological structures, with three different chemistries, three different vulnerabilities, and three different needs. Rooted is the book that explains why, and what the real science of textured hair, the follicle, and the scalp actually says. For thirty years, the dominant way of thinking about hair has been a chart drawn up in the 1990s by a celebrity hairstylist. Fourteen numbered categories, no underlying biology, no published evidence base, and now used by almost every haircare brand you have heard of. It was never built to be a science. It is the science the industry uses anyway. Olusola Idowu PhD, an AI scientist and founder of a Newcastle biotech laboratory, has spent fourteen years inside the global cosmetics industry, watching the gap between what the research knows and what the shelf delivers for textured-haired consumers. Rooted is his account of that gap, and the biology that fills it. Across ten chapters, readers will discover why the Walker scale fits almost nobody properly, and what follicle shape, keratin chemistry, disulfide topology, and cuticle biology actually…