This video, by vsauce, not only explains why yawning is contagious, but also lays out the physiology of yawning, reveals that you're less likely to yawn when your brain is cool, and gives us some delightful clips of parakeets yawning.
Your grandmother says it's because you watch too much TV. Your teacher thinks it's because you're bored. And that creepy guy on the bus just slapped you with a phonebook in an attempt to exorcise the devil living in your molars. All because you're yawning.
The PS3 was finally launched in Korea this weekend, and the fabled 80GB model was what was trotted out for the masses. The release party was a distinctly Sony affair: lots of pomp and circumstance, scantily clad models, and more press than public in attendance. But hey, 80GB PS3s! Too bad half the seats at the event…