A yawn is an involuntary reflex that involves opening the mouth wide and taking in a deep breath, followed by a slow exhale. Several theories exist about why we yawn, but researchers have not proven ...

Yes. You’re probably going to yawn while you read this. Writing this piece, and reading research on yawning, I’ve been yawning nonstop, uncontrollably. And it's not because research on yawning is ...