Memes are ideas that spread through human cultures and across the generations.
The word was invented to suggest a strong analogy with genes. I think that a new kind of replicator has recently emerged on this very planet. It is staring us in the face. It is in its infancy, still drifting clumsily about in its primeval soup, but already it is achieving evolutionary change at a rate that leaves the old gene panting far behind. The new soup is the soup of human culture.