Ok, a little bit of a jump from there to the idea of Guaranteed Life-Extension. -maybe.
But according to Abel & Kruger, a study of baseball players from 1952 shows that the ones smiling in the group photos outlived their teammates by 7 years!
Photo Credits: “cat”, by Mansee
• Source: Mendeley-Smile Intensity in Photographs Predicts Longevity | PS-Smile Intensity in Photographs Predicts Longevity (journ. of orig. pub.)
• via: PsyBlog-Smiling
• More Coverage: Miller-McCune