This Is Why We Yawn [VIDEO]

Did you just yawn by reading the title? Almost all animals with a spine yawn. Some species yawn as a social ritual, others to realign their jaw. But why do humans yawn? Check out this cool video on why we yawn.

See how long you can keep from yawning while watching this video. We all have experienced the contagious yawn now and then, but why do we do it? Scientists used to believe the practice of yawning was for more oxygen to get into your sleepy lungs, but they now think it is your body trying to cool your brain.

Please enjoy some scientific facts about yawning.

[ Source : YouTube ]

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