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David and John

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by

Mike Graham

on 9 January 2017

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Transcript of David and John

Most yawns last up to 6 seconds.Some yawns happen when you stretch.
When you yawn you reduce oxygen.Some say that yawns are caused by chemicals in brain.
You are able to yawn as early as 11 weeks old.A yawn can be a natrul human responce.
David and John
You yawn when you are tired.Yawning is contages, evenhearing the word yawn can trigger yawning.Even seeing or hearing yawning can make you yawn.
Some times you yawn when you are drowsy and when you have lack of energy.
There are more than 20 theries on why people yawn. 1 of the most popular theries is that when the level of oxygen in the body deplets we yawn.Studies however revel that yawns take away air.
this is why people yawn
BY David
Also By John
Why people yawn.
The end or is it
Full transcript