Decade ("60s" or "sixties"), although this may leave it uncertain which century is meant. These references are frequently used to encapsulate popular culture or other widespread phenomena that dominated such a decade, as in "The Great Depression of the 1930s" or "The Roaring Twenties". However, the Gregorian calendar begins with the year 1. (There is no year "zero", and the year before AD 1 is 1 BC with nothing in between.) Therefore, its "first" decade is from AD 1 to AD 10, the "second" decade from AD 11 to AD 20, and so on. So, although "the 1960s" comprises the years
Western world the "African" worlds, with no clearly specified boundaries. Additionally, "Latin American" and "Orthodox" worlds are sometimes separately considered "akin" to the West. Many anthropologists, sociologists and historians oppose "the West and the Rest" in a categorical manner. The same has been done by Malthusian demographers with a sharp distinction between European and non-European family systems. Among anthropologists, this includes Durkheim, Dumont and Lévi-Strauss. As the term ""Western world"" does not have a strict international definition, governments do not use the term in legislation of international treaties and instead rely on other definitions. In modern usage, "Western world" refers to Europe