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Nevaeh / Sierra

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by

Mike Graham

on 13 January 2017

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Transcript of Nevaeh / Sierra

Nevaeh / Sierra
closing
now you know why people yawn.
People yawn
Now a series of exments suggets a surpring reson for yawning it cools the brain.
yawning

When you start to yawn powerfull streatching of the jaw increeses blood flow .
why
hears a basic idea
yawing increeses blood flow in the neck face and head.
yawning
The deep intake of breath during a yawn
blood flow
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