The history of our world can be told through numbers. Numbers can illuminate the broad sweep of history, from vast movements of populations and the expansion of empires to the effects of technological achievements or climatic change. They also allow us to drill into the real detail of history, from the page count, the cost and the time it took to produce the Gutenberg Bible (the West's first mass-produced book) to the price of Virginian tobacco in the 1620s, both of which had an immediate and la