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With stunning photos and stories, National Geographic Explorer Wade Davis celebrates the extraordinary diversity of the world's indigenous cultures, which are disappearing from the planet at an alarming rate.

Is the beloved paper dictionary doomed to extinction? In this infectiously exuberant talk, leading lexicographer Erin McKean looks at the many ways today's print dictionary is poised for transformation.

"In an exclusive preview of his book The Stuff of Thought, Steven Pinker looks at language and how it expresses what goes on in our minds -- and how the words we choose communicate much more than we realize."