Internet memes are all the rage these days, but it may surprise you to learn that the word "meme" predates the world wide web. It was coined by evolutionary biologist Richard Dawkins in his 1976 book The Selfish Gene, where he drew a parallel between the way that genetic information propagates in the gene pool and the way that cultural information is transmitted through a culture. "Just as genes propagate themselves in the gene pool by leaping from body to body via sperms or eggs," Dawkins wrote, "so memes propagate themselves in the meme pool by leaping from brain to brain via a process which, in the broad sense, can be called imitation." Everything from how to make fire or fashion an arrowhead to fashion, jokes, and pop tunes count as memes. Seen this way, memes take on much more importance: they aren't just bits of trivia passed by word of mouth; they're essential to our evolution as a species. Learn more about memes—or as the scientific field is called, memetics—in the videos below.