Is it really possible to catch a yawn? Why dowe do it anyway? Weirdly, for such a common behaviour there is still much that science doesn’t know about yawns. But let’s explore what science does know…
WHAT EXACTLY IS A YAWN?
A yawn is an involuntary breathing movement. It involves a jaw gaping wide and a deep, long breath. Then your muscles contract briefly, and then you exhale and shut your mouth.
This movement is not unique to people. Animals of all shapes and sizes yawn –
