It is the source for one of the most enduring internet memes, but the 'Keep Calm and Carry On' motivational poster considerably predates the internet having been created by the British government towards the end of what decade?

The term meme was introduced in 1976 by British evolutionary biologist Richard Dawkins (author of "The God Delusion"). He conceived of memes as the cultural parallel to biological genes and considered them as being in control of their own reproduction.