Why Do People Yawn?

"We can put a man on the moon, but we do not understand what the function of yawning is," says Gary Hack, of the University of Maryland School of Dentistry in Baltimore.

Recently, two scientists of Princeton University have proposed that  yawning causes the walls of the maxillary sinus to expand and contract like a bellows.This causes air to pass through the brain hence lowering its temperature. Located in our cheekbones, the pyramid shaped maxillary are the largest of four pairs of sinus cavities in the human head.They drain into the nose and are present are rudimentary air cells at birth. Growth continues through childhood.

The scientist's proposal is that human brain needs to keep itself cool (just like any electronic machinery needs fan/cooling systems), hence yawing is a way to do so.

"Understanding yawning could be a useful tool for diagnosing certain medical conditions, such as epilepsy and migraines, which are both preceded by excessive yawning", says scientists.

Information Source:NatGeo


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