This video, part of the TED series, has been making the rounds on facebook.
To summarize for the video-impaired, the lecturer, Frans de Waal, a primatologist, ethologist, and professor of Primate Behavior at Emory University, shows footage of two Rhesus monkeys in a laboratory.
They are in separate cages, but they can see each other. Their task is to hand the researcher a rock.
At first, each monkey is rewarded with a piece of cucumber, and both are satisfied even though cucumbers are modest rewards. Then one monkey is rewarded a grape (a highly valued reward) for the same task, and the other is given a cucumber. The poorly rewarded monkey becomes enraged, and Dr. de Waal quips "This is essentially the Wall Street Protest, here."
