Book excerpt: Healing Clays: History, Science and Uses of the Earth's Best Kept Secret takes the reader on a documented journey through the history, uses and scientific studies on this most fascinating subject of healing clay. Contemporary society is embarking on yet another learning curve when it comes to natural elements and their benefits for general health and well-being. Using clay as an instrument for improving the health seems like an unbelievable concept to most in modern societies, but history teaches us clay was once an integral part of many culture's health practices. From Cleopatra’s beauty mask to Pliny the Elder's detailed records to clay's uses and benefits there is no doubt that we have under our feet one of earth's best kept secrets.