Hundreds of millions have watched the dance and listened to the song - most without understanding a word - but few have any idea what "Gangnam" is.
The world's largest conservation forum has opened in South Korea with warnings that reckless development was ruining the planet's natural health.
After decades of indifference government is turning up the heat on smokers in South Korea, a nation with one of the highest male smoking rates.
Despite the furore that surrounded the disqualification of Usain Bolt from the world 100m final, the IAAF refuses to change the false start rule.
"Hurray!" a group of students yells exuberantly after cresting a green mountain peak and taking out cameras to snap the scenery.