Many of us are concerned about how many plants and animals are becoming extinct, but what about human cultures? Renowned anthropologist Wade Davis warns that half of the seven-thousand languages spoken around the world are set to disappear within a generation. He calls this a danger to humanity’s survival. Davis delivered this year’s Massey Lectures which are collected in a new book. It’s called The Wayfinders: Why Ancient Wisdom Matters in the Modern World.Vodpod videos no longer available.