3rd Theorie- Yawning as the primal movement
Yawning Is Contagious: You yawn to equalize the pressure on your eardrums. This pressure change outside your eardrums unbalances other people's ear pressures, so they must yawn to even it out. Therefore in rather a Popperian movement, the movement of today’s possible yawn is nothing less than the perpetuation of the first Historical yawn.
