Yesterday I stumbled upon three dogs while walking through my
neighborhood. The dogs were generally unruly -- barking incessantly,
pulling on their leashes, and snarling at other passer-by dogs.

Now I have interacted with each of these dogs individually on numerous
occasions, and have never witnessed this behavior. It was obvious that
the presence of each other created a "group chemistry" that did not
exist in isolation.

Humans, no doubt, are the same.

The whole is greater than the sum of its parts.