When Philip Sontag first visited Antarctica as a Ph.D. student, he brought back an unusual souvenir: a huge bag of penguin ...

Humans have been making maps for as long as they’ve been exploring the Earth. Some of their cartographic maps went on to ...

Another invisible line is the Qinling-Huaihe line, which separates China into two distinct regions: the humid and subtropical south and the dry, temperate north.