South Asia - encompassing Bangladesh, India, and Pakistan - is one of the cradles of human civilization, and today it's home to one in every four people in the world. But who were the early inhabitants of South Asia, where had they come from, and what led them to develop agriculture, writing, cities, and some of the ancient world's most complex and populous societies?

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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