The Left Brain updates: I created quite a stir in the world of silk pillow cases last year when I tried to answer the question Are Silk Pillow Cases Good For Your Skin? (Follow the link for the original post and all the entertaining comments.) Silk from a sows ear? According to the ASA (the UK organization that enforces British advertising laws) it looks like I was right. Cosmeticsdesign reports that they have ruled that Direct Beauty Products have not adequately supported their advertising cla