Maybe it's just genetics, but the thing about this video that I've never been able to get out of my head is how a smile is etched into Knuth's face. Even happy

Maybe it's just genetics, but the thing about this video that I've never been able to get out of my head is how a smile is etched into Knuth's face. Even happy elderly folks usually have heavy, distinctive frown wrinkles, and you almost never see cheek wrinkles like these, let alone so pronounced. Maybe the way Knuth aged only indicates that he doesn't grimace when concentrating as most of us do, but I like to think a lifetime of smiling is responsible for the appearance. Whenever I get into the rut of thinking that life is a steady decline into loneliness and dissatisfaction, memories of this video remind me to be positive and playful.