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Yawning happens unconsciously and spontaneously, and it is one of the first things we learn to do. For centuries scientists have been searching for the reason behind yawning. They have produced many theories. Most people think yawning is a signal of sleepiness or boredom. However, the phenomenon known as contagious yawning has scientists looking deeper into the subconscious act.

Read more to find out the surprising science of yawning.

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