National Geographic Explorer Paul Salopek began his continent-spanning walk in Ethiopia in January 2013. Since then, his Out of Eden Walk, tracing humankind's journey out of Africa, has crossed 21 ...

President Trump's territorial assertions sparked a round of rethinking by mapmakers and teachers, snark on social media and sarcasm by at least one other world leader.

Mapmakers and teachers are re-thinking what to call the gulf of water between Mexico, the United States and Cuba after President Donald Trump ordered it renamed from the Gulf of Mexico to the Gulf of ...