What tech powers a global walk?

Paul Salopek is a National Geographic Explorer walking from Ethiopia to South America on foot. But it's also a journalism job. That means conducting interviews, taking photos and videos, and nonstop note-taking and writing. He joins Carolyn Beeler to peel back the curtain on the technology that has kept him connected for the past 13 years, even when he is days of travel away from the nearest outlet or wi-fi signal.