Description Reveals the profound influence of the Denisovans and their hybrid descendants upon the flowering of human civilization around the world - Traces the migrations of the sophisticated Denisovans and their interbreeding with Neanderthals and early human populations more than 40,000 years ago - Shows how Denisovan hybrids became the elite of ancient societies, including the Adena mound-building culture - Explores the Denisovans' extraordinary advances, includin.