Видео ютуба по тегу Yawning

Why is yawning contagious? - Claudia Aguirre
Why is yawning contagious? - Claudia Aguirre
Why Do We Yawn?
Why Do We Yawn?
What Is Excessive Yawning? – Dr. Berg
What Is Excessive Yawning? – Dr. Berg
Why is yawning contagious? Your yawn reflex, explained. | JUST CURIOUS
Why is yawning contagious? Your yawn reflex, explained. | JUST CURIOUS
The Yawn-O-Meter (How Long Can You Last?)
The Yawn-O-Meter (How Long Can You Last?)
The Yawning Grave
The Yawning Grave
yawning
yawning