is yawning contagious experiment

IMAGES

1. Why do I Yawn When I See Someone Else Yawning?

   

2. Why is Yawning Contagious?

   

3. Ever Wondered Why Yawning Is So Contagious? Here’s The Possible Reason

   

4. Is Yawning Contagious?

   

5. Is yawning contagious? by on Prezi

   

6. Why is yawning contagious?