Why are yawns contagious?
Yawn's Secret Wave
Why are yawns contagious?
You're sitting in class, perfectly awake, when someone across the room yawns. Suddenly your jaw drops open too — you can't help it. What just happened? Did their yawn jump into your brain like a sneeze jumps through the air?
Here's the wild part: scientists aren't entirely sure why yawns spread like this. But they have some very good guesses, and they all point to the same surprising fact — contagious yawning happens because your brain is incredibly good at copying other people.
