“A charming, thoughtful book, one that makes a powerful case for smiles as ‘social acts with consequences.’ ”—Boston Sunday Globe When someone smiles,

It reviews current research and provides guidelines for future exploration of facial expression.

An expert in nonverbal communication tackles the science of smiles and their extraordinary social impact. When someone smiles, the effects are often positive: a

The importance of facial expressions has led to a steadily growing body of empirical findings and theoretical analyses. Every decade has seen work that extends

Technology and Health: Promoting Attitude and Behavior Change examines how technology can be used to promote healthier attitudes and behavior. The book discusse