Everything you need to understand or teach Letters from Atlantis by Robert Silverberg.
Letters from Atlantis is a fantasy tale about a civilization that might have flourished about twenty thousand years ago. Scientists have figured out a way to send people's conscious minds into the past, where they lodge in the minds of their ancient hosts. The main character is Roy Colton, who has been on several such time travels. Somewhere in a laboratory of the future his body lies sleeping, while his mind lives inside...