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Nevaeh / Sierra
Transcript of Nevaeh / Sierra
now you know why people yawn.
Now a series of exments suggets a surpring reson for yawning it cools the brain.
When you start to yawn powerfull streatching of the jaw increeses blood flow .
hears a basic idea
yawing increeses blood flow in the neck face and head.
The deep intake of breath during a yawn