Anthropologist Wade Davis argues that the myriad of cultures that make up our world are "humanity's greatest legacy...the product of our dreams, the embodiment of our hopes, the symbol of all we are and all that we have created as a wildly inquisitive and astonishingly adaptive species."

In the 2009 Massey Lectures, Wade Davis takes us on an astonishing journey through some of the great cultures and civilizations on earth, fragile and endangered, yet essential to our survival as a species.

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