In the mid 19th century, French neurologist Guillaume Duchenne wanted to distinguish real smiles from fake. Interested in the response of nerves and muscles to stimulation, he applied electricity ...

Pan Am has always been synonymous with glamor ... smiling and joking – his laugh itself made you smile,” she remembers. If that wasn’t enough celebrity overload, she once shared an airport ...

Today, the full smile that uses the muscles around the mouth and eyes is known as a "Duchenne smile" – and the fake one is the "Pan Am smile", after the kind of smile you might greet someone ...

Pan Am has always been synonymous with glamor ... smiling and joking – his laugh itself made you smile,” she remembers. If that wasn’t enough celebrity overload, she once shared an airport ...