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Meme (pronounced /ˈmiːm/ or 'meem') is a word of Greek origin, referring to cultural ideas, symbols or practices transmitted from one mind to another through writing, speech, gestures or rituals. They are the cultural equivalent of genes, self-replicating and responding to selective pressures. British scientist Richard Dawkins introduced the word in the 70s during a discussion of evolutionary principles that explain the spread of ideas and cultural phenomena. (Wikipedia)