Have you had a good yawn this morning? If you wonder why we yawn, you're not alone. Scientists are trying to figure that out!
A researcher at Princeton University says yawning might the body's way of cooling the brain.
He believes when you yawn, the deep breath forces a downward flow of spinal fluid and blood from the brain that is cooled by air.
However, other experts on WebMD believe yawning is more of a social cue. In all cultures a sign of sleepiness and boredom, communicating to others that you're not thrilled but you're not angry either.
To learn how many times we yawn and all the theories about yawning- CLICK HERE
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