This is fantastic!

The included sample simulations offer unique insights into many questions such as: Do bird flocks have a leader? How much would you stand to save by upgrading the insulation of your home? How do traffic jams develop and resolve?

Watch as hundreds or even thousands of simulated animals, molecules, cells or guests at a party interact. Turn a knob or push a slider and the patterns change as each individual element in the simulation alters its behavior.

There is probably no better illustration of the ways complex behavior can arise out of nothing but large numbers of independent actors each doing its own thing by following simple rules. Incredibly mind-expanding stuff!