“A meme (it rhymes with ‘dream’) is short for mimetics, a word denoting mimicry. Dawkins wanted to identify a self-replicating unit of culture that would play a role in cultural evolution similar in some ways to the role played by self-replicating genes in the evolution of bodies. He chose the word ‘meme’ because it had one syllable, like gene, and because it sounded like gene. A meme is anything humans do or say that is not genetically determined and is passed from person to person by imitation or copying, such as the wish to ‘have a nice day.'”