What happens when there is no leader? Starlings, bees, and ants manage just fine. In fact, they form staggeringly complicated societies -- all without a Toscanini to conduct them into harmony. This hour of Radiolab, we ask how this happens.

We gaze down at the bottom-up logic of cities, Google, and even our very own brains with fire-flyologists, ant experts, neurologists, a mathematician, and an economist.