When women do find something to be genuinely funny, they feel rewarded in a way that men don't.
If you have a dog, you may have noticed that sometimes it seems to be smiling. Of course, we know that dogs don't really smile, right?
Do old folks still appreciate humor? Find out on this Moment of Science.
Laughter research has found that less than 20% of laughter is a sincere response to someone's humor. In fact, it's primarily a social signal.