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Why when a person yawn yawn person beside ?

http://www.mentalfloss.com/sites/default/legacy/wp-content/uploads/2008/05/baby-yawn.jpg 

Why when a person yawn yawn person beside ?
Yawning is a reflection of certain respiratory , aimed at increasing the flow of blood to the brain and connector expansion of some capillaries, and open
Clogged some of the alveoli in the lungs , and the public is lead to a temporary activity condition .. Thus always happens with
People exhausted .. As for the effect of infection is a famous radiation Saikovezaaúa the phenomenon .. The enthusiasm and fear and tension
And laugh all the emotions transmitted radiation Alsaikovezaaúa , enough to tighten sit with you so tense .. Show them a novel
Funny does not like you very much .. Once you laugh you laugh does not know what the reason ..
There is a saying confirms that good Almttaúb affects 7 mentality infects others .
It is also known that children before the age of two years . Not affected Ptthaab others

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