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HEADLEE: What you're hearing right now are the footsteps, the actual footsteps, of Pulitzer Prize-winning journalist Paul Salopek. He's traveling by foot from East Africa, heading northeast through China and then going all the way down to the southernmost tip of South America. Hot on his trail, students who are following him in real time online. Paul Salopek is on the cover of this December's National Geographic, where he's also a fellow. And he joins me now during a break from his trek. Also joining me is Homa Tavangar. She's an education advisor for the Pulitzer Center on Crisis Reporting, and also author of the book "Growing Up Global." Homa is helping educators and students here connect with Paul's journey. Welcome to both of you.