This week on Cool Science Radio, John and Lynn are joined by James Hamblin. Hamblin has written the book, CLEAN: The New Science of Skin. Keeping skin healthy is a booming industry, and yet it seems like almost no one agrees on what actually works. Confusing messages from health authorities and ineffective treatments have left many people desperate for reliable solutions. In his new book, James Hamblin explores how we got here, examining the science and culture of how we care for our skin today.