Louis Armstrong sang, "When you're smilin', the whole world smiles with you." Romantics everywhere may be surprised to learn that psychological research has proven this sentiment to be true — merely seeing a smile (or a frown, for that matter) will activate the muscles in our face that make that expression, even if we are unaware of it. Now, according to a new study in
Psychological Science, a journal of the
Association for Psychological Science, simply reading certain words may also have the same effect.