Egypt and Mesopotamia are the most famous civilizations of the ancient world, but at the same time in South Asia - today's Pakistan and India - an even larger and more populous society came into being: the Indus Valley Civilization, whose peak lasted from 2600 to 1900 BC. But the Indus Valley Civilization challenges much of what we think we know about ancient societies, from inequality and violence to political control.

I wrote a book, and it comes out in July! You can preorder (in hard copy, e-book, or audiobook) The Verge: Reformation, Renaissance, and Forty Years that Shook the World here.

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