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Describes the life and work of Eratosthenes, the Greek geographer and astronomer who accurately measured the circumference of the Earth.

The civilizations of ancient India had their own different governments. In the Indus Valley Civilization, priest kings were at the head of government. The Maurya Empire boasted a stable, centralized government that allowed the flourishing of trade and culture. That government had weakened by the time of the Gupta Empire, opening the gates to foreign invaders and civil wars. This informative volume charts the changes in leadership in ancient India...