Why do people cluster together in neighbourhoods?
How do Internet communities spring up from nowhere?

Why is a brain conscious even though no single neuron is? What causes a media frenzy?The answer, as Steven Johnson’s groundbreaking book shows, is emergence- change that occurs from the bottom up. When enough individual elements interact and organize themselves, the result is collective intelligence

even though no one is in charge. It is a phenomenon that exists at every level of experience, and will revolutionize the way we see the world.