Reprinted with permission from SFARI.org, an editorially independent division of the Simons Foundation. (Find original story here.) Boredom, tiredness, hunger and stress can all set off a yawn. People ...
A new study found that most children don't yawn contagiously until about age 4, and that children with autism spectrum disorders (ASD) are less likely to yawn in response to another person yawning ...
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