The Iroquois and their nation of independent tribes were joined under a complex constitution that was passed on orally. Unfortunately, we have no verifiable written evidence from the time it was created although there exists several versions that were written down at later times. The writers of the Constitution of the United States were well aware of the Iroquois Constitution and parts were incorporated into the US Constitution.
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He trained rats in the correct route through a maze,then deliberately damaged their brains and observed that this did not inhibit their progress through the maze.