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Why yawning is contagious

Yawning is contagious. Even thinking about yawning is enough. In fact, there's a 50% that you're about to, or just did, yawn. Some studies have suggested that infectious yawning developed to keep groups of animals alert. The increase of oxygen to their brain will help ready them for action. http://www.omgfacts.com/Animals/Yawning-is-contagious-Even-thinking-abou/1844

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