History > The Mainspring of Human Progress
The Mainspring of Human Progress

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by Henry Grady Weaver. Perhaps the best account of the history of human freedom and progress available. The author answers such questions as: What is the greatest of all our modern inventions? Who invented zero (0) and why? What was the "bestseller" in 1776? What is the difference between a republic and a democracy? What simple invention contributed most to our national wealth?