At first blush, you look happy -- or sad, or angry

Our faces broadcast our feelings in living color -- even when we don't move a muscle. That's the conclusion of a groundbreaking study into human expressions of emotion, which found that people are able to correctly identify other people's feelings up to 75 percent of the time -- based solely on subtle shifts in blood flow color around the nose, eyebrows, cheeks or chin. The study, published in the Proceedings of the National Academy of Sciences this week, demonstrates a never-before-documente