Yawning
There are many mysteries in medicine, but one human and animal behavior that has been observed for years but is poorly understood, is yawning . It is easy to define since it is so common. It is a form of reflex that involves a deep inspiration, opening the jaw wide, and a rapid exhalation of the inspired air. There is generally a feeling of relaxation immediately after the yawn Answering this question is not nearly as easy as defining the action. There are a number of theories about why we yawn, but remarkably little good research on this topic. There are several agreed upon causes for yawning, however. First, it that when changing elevation rapidly as in an airplane, you will both voluntarily (on purpose) yawn and also involuntarily (not on purpose) yawn to try and equalize pressures within your ear. This works and is an accepted reason for yawning. Another indisputable cause of yawning is called social empathy. What this means in plain English is “suggestion.” If you...