Yawning

This unconditioned reflex is a mystery that scientists have been trying to solve for a long time. Yawning occurs when we feel tired, sleepy or bored. There are several reasons why we yawn; some theories say that it is because we do not have enough oxygen, while others say it's our body's way of getting the nervous system working (like when we feel bored or tired). Another cause for yawning? We may also be feeling hot.
Fact: According to the Guinness World Records, the longest yawn ever recorded was by a 15 year-old-girl who yawned for 5 whole weeks. 

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