A researcher studied makeup photos of 100 deceased athletes and divided them into three types based on their facial expressions : deadpan , toothy smile and big laugh   The researchers found that of the 100 deceased athletes, the deadpan lived to an average of 72 9 years, the grins lived to about 75 years and the big laughs lived to 79 9 years
What kind of facial expression the athletes take is determined by the photographer's request
 The researchers therefore believe that attitudes can affect how long people live