Why Can't You Stop Yawning?

Have you ever wondered why we yawn? 😮
Many people think yawning happens only when we're sleepy, but the science is much more interesting! In this video, you'll learn how yawning may help cool your brain, why it happens when you're tired or bored, and why yawning is contagious.
Can you watch this entire video without yawning? 😏
Watch till the end and find out the surprising science behind one of the most common things humans do every day!
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Видео Why Can't You Stop Yawning? канала why wonders