Cosmetic chemists have been reading between the lines for decades. After all, as everyone knows, it's the mortar in the bricks-and-mortar makeup of the stratum corneum where much of the magic happens. Now, researchers have detailed the structure and distribution of spaces in the body that they maintain represent a newfound human organ, and this “organ” just might be your body's biggest — but not all experts are convinced.   It's the part of the body know...