
How does a bird flock keep its movements so graceful and synchronized? Most people assume that the bird in front leads and the others follow. In fact, bird flocks don't have leaders: they are organized without an organizer, coordinated without a coordinator. And a surprising...

Does every group have a leader? Does every pattern have a central cause? Most people tend to think so. Increasingly, decentralized models are being chosen for the organizations and technologies they construct in the world, and for the theories they construct about the world...
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