There are many theories about why people yawn, but no one knows for sure.
A yawn is a reflex consisting of the simultaneous inhalation of air and the
stretching of the ..... George Washington said, "If You Cough, Sneeze, Sigh, or
Yawn, do it not Loud but Privately; a...
Sep 23, 2011 ... 23, 2011-- Why do we yawn? ... So do most vertebrate animals. ... When you start
to yawn, powerful stretching of the jaw increases blood flow in ...
Jun 10, 2013 ... We all do it, and we all know it has at least something to do with how tired we feel
. ... about yawning can trigger one (did we get you yet?)
If you yawn in class, you'll probably notice a few other people will start yawning,
too. Why is that?
Feb 29, 2016 ... Excessive yawning is yawning that occurs frequently, sometimes without any
apparent reason. Learn about possible causes and treatments for ...
Don't misunderstand, we aren't intending to bore you, but just reading about
yawning will make you do it, just as seeing or hearing someone else yawn makes
May 12, 2014 ... A new study has suggested that the reason we yawn has nothing to do ... thanks
to the yawning and your newly-cooled brain, you're probably ...
Jun 28, 2013 ... Cats and dogs do it. Even human babies do it inside the womb. And maybe after
seeing the picture above, you're doing it now: yawning.
Nov 16, 2011 ... Despite what you may have heard, yawning has nothing to do with increasing the
body's oxygen supply. In experiments, subjects yawn just as ...