Popular educational and inspirational TED talks recently posted this excerpt from Frans de Waal’s full speech, and now it is trending again.

While discussing moral behavior in animals, Frans and his team conducted an experiment where two monkeys would receive the same payment of a cucumber slice for completing a task. 

At first they are both satisfied with their cucumber. But when one of the monkeys is given an ‘expensive’ grape instead, his counterpart is disgusted with his measly cucumber and throws the piece in the face of the experiment technician

The implications of the experiment are quite obvious.