29. Children With Autism Don’t Yawn As Much
Autism is a neurological condition that, among other things, is characterized by challenges with social behaviors and communication. Seeing as yawning actually is a social behavior and that it attempts to communicate something across a group of people, we shouldn’t be surprised that children (and adults) with autism don’t yawn as much.
There have been studies on autistic children to determine whether or not they yawn contagiously. When autistic children are around non-autistic children who are yawning, those with autism are much less likely to yawn in response.