Group living is common across many species, and group sizes range from small (e.g., the Elephant herd and Lion pride) to very large (e.g., bird flocks or fish schools). Different species evolved ...

In the natural world -- where predators pounce, prey flee, and group members feed and sleep in solidarity -- animal behavior is glorious in its variety. Now, new research suggests there may be an ...

When a crowd of passengers on a burning ship jumps overboard, when schoolboys go calmly through a fire drill, when four clubmen stage a drinking spree, when a mob of strikers overturns police cars, ...

What happens when thousands of living agents such as cells, insects or microbes, pack together so tightly that they begin to behave not as individuals, but as a material? The answer, it turns out, is ...