[STEM Classroom] Lesson 18: Why is yawning contagious?
Published on 08 Nov 2020

According to research, when someone yawns, 55% of the people around will yawn. The contagion of yawning can even be felt through the monitor! Why is yawning so contagious?

The video is produced by STEM Initiative Hong Kong and is funded by the Croucher Foundation.