In November 2017, after a lengthy meeting with Chinese president Xi Jinping, Donald Trump boasted that he and Xi can solve “probably all” the world’s problems. Today, he believes he alone can solve ...

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.

Because the world is a sphere, it is difficult to accurately project this on a two-dimensional map. When the world is flattened to fit on a piece of paper it is distorted. This makes some ...