Stone Age Email

In two ways the email used in the stone age was more sophisticated than what we use today. They did not have writing, but when they send an invoice with a shipment of animals, they would fill a clay ball with tokens, one per animal, then seal the ball by stamping it with the sender’s seal. The receiver would break the ball and count the tokens. The system prevented counterfeiting. It also provided privacy for the message is transit.

Stories from the Stone Age: Waves of Change 
~ Roedy (1948-02-04 age:70)