Pausch uses supporting details related to his childhood to support his central idea.
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How wide is the Amazon river at its widest point
To declare boundaries between the thirteen colonies and the Appalachian Mountains, so American colonists couldn’t create tension with the French and Native Americans who live across the mountains.
President Carter's attempts to free the hostages were done in good faith and effort, but were hampered by failures in communication, delivery and execution. The plan involved servicemen who were not as well-trained as they could have been and certain weather effects like the "haboob" which was a big dust cloud, doomed the mission. Carter does deserve credit for taking responsibility for the failure however.