NCBI ROFL: Smile intensity of baseball players in photographs predicts longevity.

Smile Intensity in Photographs Predicts Longevity "Previous studies have found that positive emotions, as inferred from smile intensity in childhood photos and college yearbook photos, are correlated with marriage stability and satisfaction (Harker & Keltner, 2001; Hertenstein et al., 2009). The present study is the first to link smile intensity to a biological outcome: longevity. Little information (other than smile intensity) was available regarding the individuals in the previously mentioned photo studies. In the current study, however, we were able to include many additional factors known to influence longevity because of the group we elected to evaluate. We focused on Major League Baseball (MLB) players because detailed statistics are available for each player (dating back prior to 1900), and because MLB players represent a homogeneous occupational group. We (and other researchers) have used this database to examine numerous factors related to longevity (Abel & Kruger, 2005, 2006, 2007; Kalist & ...