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Over a decade ago, Richard Dawkins, who contributes a foreword to this book, coined the term "meme" for a unit of culture that is transmitted via imitation and naturally "selected" by popularity or longevity. Dawkins used memes to show that the theory known as Universal Darwinism, according to which "all life evolves by the differential survival of replicating entities," applies to more than just genes. Now, building on his ideas, psychologist Blackmore contends that memes can account for many forms of human behavior that do not obviously serve the "selfish gene." For example, a possible gene-meme co-evolution among early humans could have selected for true altruism among humans: people who help others (whether or not they are related) can influence them and thus spread their memes.