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Out of Eden Walk: When you walk across entire continents, police take notice

National Geographic Explorer Paul Salopek is on a decadeslong project to walk from East Africa to South America. In his 13 ...

The best night-sky apps, according to park rangers and aurora chasers

Hoping for a glimpse of the Milky Way? These user-friendly apps help stargazers learn more about objects in the sky, check ...