Why is Yawning Contagious, Study Says It Might Have Evolved to Increase Vigilance Within a Group

Why is Yawning Contagious, Study Says It Might Have Evolved to Increase Vigilance Within a Group

Ever wondered why watching someone yawn instantly triggers a similar urge in you to open your mouth? While scientists have understood the physiological purpose behind yawning, the reason why it is so contagious among social animals has kept them puzzled. According to Andrew Gallup, an evolutionary biologist from the State…