Australians and New Zealanders tend to get annoyed when their accents get mistaken for one another, but there's one thing they do share. Both countries can lay claim to hosting the world's friendliest city, with Melbourne and Auckland jointly taking top honors in a new survey. Another southern hemisphere destination -- South Africa's Johannesburg -- didn't fare quite as well, being named as the most unfriendly.

Thanks to the U.S. State Department, Beijing residents finally have the answer to one of the city’s greatest mysteries: How often is the air polluted? Well, a lot, a resident would say. But how many is a lot?