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
1900s (decade) "nineteen-six" is less common; "nineteen-aught-six" is recognized but not much used. In the post–World War II era through the 1990s, mentions of "nineteen-ought-six" or "aught-six" often distinctly connoted old-fashioned speech; for example, it was once used to add to the geriatric-humor effect in the dialogue of the Grampa Simpson character. The strength of the comedic effect diminished during the aughts of the next century, as the public grew used to questioning how to refer to an "ohs" or "aughts" decade. Prominent assassinations, targeted killings, and assassination attempts include: The cost of an American postage stamp was 1 cent. The Tour