Yearbook Photo: Can It Predict Happiness, Divorce, Even Death?

"studied yearbook and childhood photos...Those who smiled least, compared to those who smiled most, were actually five times more likely to be divorced at some point in their life,"

Next, "230 photos of baseball players...Baseball players who turned a high-wattage smile on the photographer were only half as likely to die during any given year as those who smiled only partially or not at all. Those who showed a half-hearted smile lived longer than those who didn't smile at all, but not as long as their grinning teammates."

And how do you detect a genuine smile? In the "1860s... Duchenne studied the mechanics of smiling using electrical currents to stimulate facial muscles and discovered that while we can make our mouths smile on cue, we can’t do the same with our eyes. The eyes, therefore, can be used to “unmask a false friend,” as he famously wrote. Hence the term “Duchenne smile,” still used by researchers today.

https://www.google.com/amp/s/www.forbes.com/sites/melaniehaiken/2014/04/07/can-your-yearbook-photo-predict-happiness-divorce-death/amp/