A group of my neighbors had taken their house party to the street. Streams of smiling people without face masks spilled into the cul-de-sac ahead of me, blocking my only route home.

In a striking and controversial image, the group was seen smiling and posing for selfies in front of the raging Southern California wildfire, which has caused widespread devastation across the area.

The singing group of young people, culled from all over the world, performed in five halftime performances between 1976 and 1986. Although they don't have the spotlight of the Super Bowl anymore, ...

The second potential explanation: the researchers noted that people who express positive emotions tend to elicit positive emotions in other people (in simpler terms, smiling is contagious).